This work was supported by the Ministry of Science and Technology, Taiwan, Republic of China through Grant No. 101-2113-M-001-006-MY3.

TCDAP 12 1. 준비 <ol><li> 문학 절차 (13)에 따라 TCDAP을 합성. </li><li> 340 (270)에서 설정된 세 개의 온도 영역에 온도 구배 승화 법에 의해 TCDAP 생성물을 정제하고, 250 ° C 각각 10-6 토르 (12, 14)의 진공 압력하에. </li></ol> 2. TCDAP 물리적 증기 전송을 사용하여 (PVT) 시스템 (14)의 단결정을 성장 <ol><li> (1.2 cm 직경으로 15 cm 길이) (5 cm 길이) 보트의 일단에 TCDAP 샘플을 넣어 유리 내통에 보트 로딩. </li><li> 긴 유리 (83cm 길이 직경 2cm) 튜브 내부 튜브를로드하고 개방에서 약 17cm에 밀어 넣습니다. </li><li> (길이 60cm, 직경 2.5 cm)이 수평 선반에 고정 된 구리 튜브로 긴 유리 튜브를로드; 확인 TCDAP의 보트의 가열 대역 AR에서 정의한 가열 영역의 중간에 위치되어 있는지 확인구리 관 아 운드. </li><li> 은 30cc / 분의 유량으로 헬륨 가스로 PVT 시스템을 제거하고 310 ℃로 가열 대역을 데워 변압기 켜; 이틀 동안이 온도에서 유지한다. </li><li> 실온으로 시스템을 냉각시킨 후, 내부 튜브의 결정을 수집한다. </li></ol> 3. 디바이스 제조 <ol><li> 30 분마다, 순차적으로, 바이알에 200 ㎛의 두께, 투명, 프리 컷 PET 기판 (2cm X 1cm)을 넣고 세제에서 초음파, 증류수 및 아세톤으로 청소. 질소 흐름에 의해 기판을 건조. </li><li> 애완 동물 기판에 양면 테이프를 놓습니다. </li><li> 실체 현미경 하에서 결정을 검사합니다. 장치 제조를위한 ~ 5mm X ~ 0.03 mm의 크기로 결정 빛나는, 좋은 품질을 선택합니다. 양면 테이프의 PET 기판의 길이와 바늘 형상 TCDAP 결정 평행하게 배치하고 확실하게 고정한다. </li><li> 실체 현미경에서 와트 적용소스 및 드레인으로서 작용하는 결정의 양단으로부터 연장되는 라인 (몇 mm)의 마이크로 리터 주사기 바늘을 통한 ER 계 콜로이드 흑연. 건조 (0.6-1 mm에서 유지)를 정확한 채널 길이를 결정하기 위해 광학 현미경으로 두 흑연 스폿 간의 거리를 측정하는 콜로이드 흑연에 대해 30 분 동안 기다린다. </li><li> 현미경 슬라이드에 PET 기판을 해결하기 위해 탄소 전도성 테이프를 사용합니다. 성막 실의 열분해 반응 관의 끝 부분에 슬라이드를 놓는다. </li><li> 유전 절연체의 전구체 0.5 g, [2.2] paracyclophane의 무게를 측정하고, 열분해 관의 입구 근처에 배치합니다. </li><li> 10-2 Torr의 진공 시스템을 펌프. 700 ℃의 사전 설정된 온도로 상기 튜브 위로의 중심 근처 열분해 영역을 미리 가열하고,이 온도에서 유지한다. </li><li> 150 °의 C에 [2.2] paracyclophane 샘플을 가열. 전구체의 증기는 열분해 구역을 통과하게중합 열분해 관의 끝 부분에 응축 단량체를 얻었다. </li><li> 열분해 / 중합 반응을 2 시간 동안 계속하자. </li><li> 시스템을 냉각 및 열분해 튜브에서 샘플을 꺼내. </li><li> 층의 단차를 측정하고, 기판은 제조자의 지시에 따라 프로파일로 미터를 이용하여 증착 된 유전체 층의 두께를 결정한다. </li><li> 게이트 전극의 역할을하는 결정 상기 유전체층의 뒷면에 광고의 마이크로 리터 주사기 바늘을 이소프로판올 계 콜로이드 흑연을 적용한다. </li></ol> 4. 장치의 성능을 측정 <ol><li> 접속 용의 아래에 전극을 노출시키기 위해 상기 소오스 / 드레인 전극 영역 위에 폴리머 유전체 막의 구멍을 잘라 메스를 사용한다. </li><li> 스탠드와 클램프의 도움과 접촉 파라미터 분석기에서 전극 프로브를 가지고소스 / 드레인 / 게이트 전극. 제조자의 지시에 따라 다른 게이트 전위의 IV 특성을 기록한다. 참고 : 여기에, 게이트 전위는 15 V 단계에서 60 V에 -60 V에서 설정됩니다. </li></ol> 5. 굽힘 실험 <ol><li> 다른 반경 (14.0 mm, 12.4 mm, 8.0 mm, 5.8 mm)의 실린더 주위의 유연한 PET 기판의 뒷면을 래핑, 인장 상태의 특성을 측정하고 진공 테이프로 사방에 실린더의 PET 기판을 해결하려면 . </li><li> 소스 / 드레인 / 게이트 전극에 프로브를 연결하고, 4.2에 기재된 바와 같이 상이한 게이트 전위의 IV 특성을 측정한다. </li><li> 압축 상태에서 측정하기 위하여, 실린더의 단부 주위의 PET 기판의 앞쪽 절반을 래핑, 결정 / 소스 / 드레인 / 게이트 전극 아직 실린더 향하게되도록 여전히 노출되어있다. 진공 테이프 (그림 참조와 실린더의 PET 기판을 고정합니다. (5) </strong&gt;). </li><li> 소스 / 드레인 / 게이트 전극에 프로브를 연결하고, 4.2에 기재된 바와 같이 상이한 게이트 전위의 IV 특성을 측정한다. 주 : 디바이스 구조의 단면도는도 그림에 도시되어있다. 1. </li></ol>

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The authors have nothing to disclose.

이 실험에서는, 다수의 파라미터는 전계 효과 이동도의 성공적인 측정에 영향을 미친다. 우선, 단결정 충분한 특성 측정 용 전계 효과 장치로 제조 될 수 있어야한다. 물리적 증기 전송 (PVT) 방법은 큰 결정을 성장시킬 수있는 하나입니다. 온도 및 캐리어 가스의 유량을 조절함으로써, 결정의 최대 크기 절반 cm 얻을 수있는 것이다. 둘째, 단결정의 선택은 중요하다. 명백한 단결정은 결정의 번들을 ...

센서, 디스플레이, 전자 착용 소프트 전자 기기는, 현재 설계중인 더욱 활발히 연구 및 많은 심지어 최근 1,2,3,4-에서 시장에 출시되어있다. 유기 반도체 물질로 인해 낮은 개발 비용을 포함하여 자신의 고유 한 장점을이 전자 장치에있어서 중요한 역할을 할 수있는 능력은 특히 유연성 무기 반도체 5,6- 비교할 때, 용액 또는 낮은 온도에서 제조하고있다. 이 전자에 대한 하나의 특별한 배려는 자주 굽힘을 실시 할 것입니다. 굽힘은 부품 및 장치 내에서 재료의 변형을 소개합니다. 이러한 장치가 구부러진 다 같이 안정적이고 일관된 성능이 필요합니다. 트랜지스터는 이러한 전자의 대부분의 중요한 구성 요소이며, 굽힘에서 성능이 관심이다. 다수의 연구는 유기 t 절곡하여 성능 문제를 다루었힌 필름은 7,8 트랜지스터. 굴곡에 따라 전도도의 변화가 다결정 박막의 입자 사이의 간격의 변화에 ​​기인 할 수 있지만, 물어보다 근본적인 문제는 전도성이 굴곡에 따라 단결정 내에서 변경할 수 있는지 여부입니다. 잘 유기 분자 사이의 전하 수송은 분자와 중립 및 충전 상태 (9) 사이의 상호 관련된 조직 개편 에너지 사이의 전자 결합에 크게 의존 허용됩니다. 전자 커플 링은 이웃 분자 사이의 국경 분자 궤도 함수의 중첩까지의 거리에 매우 민감하다. 잘 정렬 된 결정의 굽힘 변형을 소개하고 결정 내에서 분자의 상대적 위치를 변경할 수 있습니다. 이는 단결정 기반 전계 효과 트랜지스터로 시험 할 수있다. 하나의 리포트 (10)를 절곡시 결정의 두께의 효과를 연구하기 위해가요 성 기판 상에 루 브렌의 단결정을 사용 하였다. 드평평한 기판 상에 제조 된 구리 프탈로시아닌 나노 결정으로 악 11 굽힘시 높은 이동성을 가지고 도시되었다. 그러나, 다른 방향에서의 FET 디바이스의 굴곡의 속성이 탐색되지 않았다. 분자 5,7,12,16 테트라 클로로 6,13- diazapentacene (TCDAP)은 n 형 반도체 재료 (12)이다. TCDAP의 결정은 3.911 Å의 셀 길이의 단위 셀의 ㄱ 축을 따라 이웃 분자 사이의 이동 π-π 스태킹과 단사 포장 모티브를 가지고있다. 크리스탈은 긴 바늘을 제공하는이 포장 방향에 따라 성장한다. 이 방향을 따라 측정 된 최대의 n 형 전계 효과 이동도는 cm 2 / V · 초 3.39 이르렀다. 부서지기 쉬운 연약한 많은 유기 결정과는 달리, TCDAP 결정은 매우 유연하게 발견된다. 본 연구에서는 도통 채널로 TCDAP을 사용 플렉시블 기판 O의 단결정 전계 효과 트랜지스터를 제조F 폴리에틸렌 테레 프탈레이트 (PET). 이동성 (하방) 또는 (상방), 게이트 / 유전체 측으로 굴곡 플렉시블 기판을 향해 장치 절곡하여, 평면 기판 상에 액정을 측정 하였다. IV 데이터는 이웃 간의 겹침 / 결합 거리의 변화에 기초하여 분석 하였다 분자.

<table><tbody><tr><td>Colloidal Graphite (water-based)</td><td>TED PELLA,INC</td><td>NO.16053</td><td></td></tr><tr><td>Colloidal Graphite (IPA-based)</td><td>TED PELLA,INC</td><td>NO.16051</td><td></td></tr><tr><td>[2.2]Paracyclophane, 99%</td><td>Alfa Aesar</td><td>1633-22-3</td><td></td></tr><tr><td>polyethylene terephthalate</td><td>Uni-Onward</td><td></td><td></td></tr><tr><td>Mini-Mite 1,100 &amp;deg;C Tube Furnaces (Single Zone)</td><td>Thermo Scientific</td><td>TF55030A</td><td></td></tr><tr><td>Agilent 4156C Precision Semiconductor Parameter</td><td>Keysight</td><td>HP4156</td><td></td></tr></tbody></table>

effect of bending on the electrical characteristics of flexible organic single crystal-based field-effect transistors

유기 반도체에서의 전하 수송은 대단히 전자 결합에 영향을 미치는 결정에 분자 포장에 매우 의존한다. 그러나, 유기 반도체가 중요한 역할을하는 부드러운 전자에, 장치가 구부러됩니다 또는 반복적으로 접혀. 결정 패킹 따라서 전하 수송에 휨의 효과는 소자의 성능에 결정적이다. 이 논문에서는, 전계 효과 트랜지스터의 구성 5,7,12,16 테트라 클로로 6,13- ​​diazapentacene (TCDAP) 단결정 구부러 및 결정 굽힘에 재현 IV 특성을 획득하기 위해 상기 프로토콜을 설명한다. 그 결과, 전하 이동도 거의 가역적 아직 대향 추세 플렉시블 기판 결과에 제조 된 전계 효과 트랜지스터 굽힘 굽힘 방향에 따라 보여준다. 장치가 탑 게이트 / 유전체 층 (상향 압축 상태)을 향해 절곡 될 때 감소되는 이동성 증대NT 결정 / 기판 측 (하방으로 인장 상태)를 향해. 곡률 휨의 효과는 또한 높은 굽힘 곡률 인한 이동성의 변화를 관찰 하였다. 이 제안된다함으로써 전자 결합 이후의 캐리어 수 송능을 좌우 절곡시 분자간의 π-π 거리가 변화한다.

단결정 XRD 분석 TCDAP는 ㄱ 축.도 함께 포장 분자 확장 π 시스템임을 보여준다. 2는 TCDAP 결정을위한 분말 XRD에 의한 주사 패턴을 보여줍니다. 날카로운 피크의 일련의 결정의 분말 회절 패턴과 비교하여, 단 (0, K, ℓ)면의 계열에 대응하는 관찰된다. 이도에 도시 된 바와 같이, 결정 구조가 배향되어 있다는 것을 의미한다. 3....

Watch this Scientific Journal Video about Effect of Bending on the Electrical Characteristics of Flexible Organic Single Crystal-based Field-effect Transistors at JoVE.com

Effect of Bending on the Electrical Characteristics of Flexible Organic Single Crystal-based Field-effect Transistors

본 논문의 전자 특성 측정을위한 작동 장치를 유지하기위한 유기 단결정 기반 전계 효과 트랜지스터의 절곡 가공을 설명한다. 결과는 제안 그 결정의 분자 간격에 따라서 유연 전자에서 중요하다 충전 호핑 속도의 굽힘 원인 변경.

유연한 유기 단결정 기반 전계 효과 트랜지스터의 전기적 특성에 영향 절곡

The charge transport in an organic semiconductor depends highly on the molecular packing in the crystal, which influences the electronic coupling ...

effect-bending-on-electrical-characteristics-flexible-organic-single

Universidad de Cartagena UDEC

Research

JoVE Journal

Engineering

8.0K 조회수.  Academia Sinica.  본 논문의 전자 특성 측정을위한 작동 장치를 유지하기위한 유기 단결정 기반 전계 효과 트랜지스터의 절곡 가공을 설명한다. 결과는 제안 그 결정의 분자 간격에 따라서 유연 전자에서 중요하다 충전 호핑 속도의 굽힘 원인 변경. 

비디오: Effect of Bending on the Electrical Characteristics of Flexible Organic Single Crystal-based Field-effect Transistors

Concurrent Quantitative Conductivity and Mechanical Properties Measurements of Organic Photovoltaic Materials using AFM

Organic photovoltaic (OPV) materials are inherently inhomogeneous at the nanometer scale. Nanoscale inhomogeneity of OPV materials affects performance of photovoltaic devices. Thus, understanding of spatial variations in composition as well as electrical properties of OPV materials is of paramount importance for moving PV technology forward.1,2 In this paper, we describe a protocol for quantitative measurements of electrical and mechanical properties of OPV materials with sub-100 nm resolution. Currently, materials properties measurements performed using commercially available AFM-based techniques (PeakForce, conductive AFM) generally provide only qualitative information. The values for resistance as well as Young's modulus measured using our method on the prototypical ITO/PEDOT:PSS/P3HT:PC61BM system correspond well with literature data. The P3HT:PC61BM blend separates onto PC61BM-rich and P3HT-rich domains. Mechanical properties of PC61BM-rich and P3HT-rich domains are different, which allows for domain attribution on the surface of the film. Importantly, combining mechanical and electrical data allows for correlation of the domain structure on the surface of the film with electrical properties variation measured through the thickness of the film.

Organic photovoltaic (OPV) materials are inherently inhomogeneous at the nanometer scale. Nanoscale inhomogeneity of OPV materials affects performance of photovoltaic devices. In this paper, we describe a protocol for quantitative measurements of electrical and mechanical properties of OPV materials with sub-100 nm resolution.

동시 수량 전도성과 AFM을 사용하여 유기 태양 광 재료의 기계적 성질 측정

Organic photovoltaic  (OPV) materials are inherently inhomogeneous at the nanometer scale. Nanoscale  inhomogeneity of OPV materials affects performance ...

연구

공학

Strain Sensing Based on Multiscale Composite Materials Reinforced with Graphene Nanoplatelets

The electrical response of NH2-functionalized graphene nanoplatelets composite materials under strain was studied. Two different manufacturing methods are proposed to create the electrical network in this work: (a) the incorporation of the nanoplatelets into the epoxy matrix and (b) the coating of the glass fabric with a sizing filled with the same nanoplatelets. Both types of multiscale composite materials, with an in-plane electrical conductivity of ~10-3 S/m, showed an exponential growth of the electrical resistance as the strain increases due to distancing between adjacent functionalized graphene nanoplatelets and contact loss between overlying ones. The sensitivity of the materials analyzed during this research, using the described procedures, has been shown to be higher than commercially available strain gauges. The proposed procedures for self-sensing of the structural composite material would facilitate the structural health monitoring of components in difficult to access emplacements such as offshore wind power farms. Although the sensitivity of the multiscale composite materials was considerably higher than the sensitivity of metallic foils used as strain gauges, the value reached with NH2 functionalized graphene nanoplatelets coated fabrics was nearly an order of magnitude superior. This result elucidated their potential to be used as smart fabrics to monitor human movements such as bending of fingers or knees. By using the proposed method, the smart fabric could immediately detect the bending and recover instantly. This fact permits precise monitoring of the time of bending as well as the degree of bending.

The integration of conductive nanoparticles, such as graphene nanoplatelets, into glass fiber composite materials creates an intrinsic electrical network susceptible to strain. Here, different methods to obtain strain sensors based on the addition of graphene nanoplatelets into the epoxy matrix or as a coating on glass fabrics are proposed.

The electrical response of NH2-functionalized graphene nanoplatelets composite materials under strain was studied. Two different manufacturing methods are ...

Sensing of Barrier Tissue Disruption with an Organic Electrochemical Transistor

The gastrointestinal tract is an example of barrier tissue that provides a physical barrier against entry of pathogens and toxins, while allowing the passage of necessary ions and molecules. A breach in this barrier can be caused by a reduction in the extracellular calcium concentration. This reduction in calcium concentration causes a conformational change in proteins involved in the sealing of the barrier, leading to an increase of the paracellular flux. To mimic this effect the calcium chelator ethylene glycol-bis(beta-aminoethyl ether)-N,N,N&#39;,N&#39;-tetra acetic acid (EGTA) was used on a monolayer of cells known to be representative of the gastrointestinal tract. Different methods to detect the disruption of the barrier tissue already exist, such as immunofluorescence and&#160;permeability assays. However, these methods are time-consuming and costly and not suited to dynamic or high-throughput measurements. Electronic methods for measuring barrier tissue integrity also exist for measurement of the transepithelial resistance (TER), however these are often costly and complex. The development of rapid, cheap, and sensitive methods is urgently needed as the integrity of barrier tissue is a key parameter in drug discovery and pathogen/toxin diagnostics. The organic electrochemical transistor (OECT) integrated with barrier tissue forming cells has been shown as a new device capable of dynamically monitoring barrier tissue integrity. The device is able to measure minute variations in ionic flux with unprecedented temporal resolution and sensitivity, in real time, as an indicator of barrier tissue integrity. This new method is based on a simple device that can be compatible with high throughput screening applications and fabricated at low cost.

The Organic Electrochemical Transistor is integrated with live cells and used to monitor ion flux across the gastrointestinal epithelial barrier. In this study, an increase in ion flux, related to disruption of tight junctions, induced by the presence of the calcium chelator EGTA (ethylene glycol-bis(beta-aminoethyl ether)-N,N,N',N'-tetra acetic acid), is measured.

유기 전기 트랜지스터와 장벽 조직 혼란의 감지

The gastrointestinal tract is an example of barrier tissue that provides a physical barrier against entry of pathogens and toxins, while allowing the ...

생체공학

Preparation of Liquid Crystal Networks for Macroscopic Oscillatory Motion Induced by Light

A strategy based on doped liquid crystalline networks is described to create mechanical self-sustained oscillations of plastic films under continuous light irradiation. The photo-excitation of dopants that can quickly dissipate light into heat, coupled with anisotropic thermal expansion and self-shadowing of the film, gives rise to the self-sustained deformation. The oscillations observed are influenced by the dimensions and the modulus of the film, and by the directionality and intensity of the light. The system developed offers applications in energy conversion and harvesting for soft-robotics and automated systems.
The general method described here consists of creating free-standing liquid crystalline films and characterizing the mechanical and thermal effects observed. The molecular alignment is achieved using alignment layers (rubbed polyimide), commonly used in the display manufacturing industry. To obtain actuators with large deformation, the mesogens are aligned and polymerized in a splay/bend configuration, i.e., with the director of the liquid crystals (LCs) going gradually from planar to homeotropic through the film thickness. Upon irradiation, the mechanical and thermal oscillations obtained are monitored with a high-speed camera. The results are further quantified by image analysis using an image processing program.

The goal of the protocol is to create liquid crystalline polymer films that can mechanically oscillate under continuous light irradiation. We describe in great detail the conception of free-standing films, from the liquid crystal alignment method to the photo-actuation. The experimental protocol applied to prepare this material is broadly applicable.

빛에 의해 유도 된 거시적인 진동 모션 액정 네트워크의 준비

A strategy based on doped liquid crystalline networks is described to create mechanical self-sustained oscillations of plastic films under continuous ...

Electric-field Control of Electronic States in WS2 Nanodevices by Electrolyte Gating

A method of carrier number control by electrolyte gating is demonstrated. We have obtained WS2 thin flakes with atomically flat surface via scotch tape method or individual WS2 nanotubes by dispersing the suspension of WS2 nanotubes. The selected samples have been fabricated into devices by the use of the electron beam lithography and electrolyte is put on the devices. We have characterized the electronic properties of the devices under applying the gate voltage. In the small gate voltage region, ions in the electrolyte are accumulated on the surface of the samples which leads to the large electric potential drop and resultant electrostatic carrier doping at the interface. Ambipolar transfer curve has been observed in this electrostatic doping region. When the gate voltage is further increased, we met another drastic increase of source-drain current which implies that ions are intercalated into layers of WS2 and electrochemical carrier doping is realized. In such electrochemical doping region, superconductivity has been observed. The focused technique provides a powerful strategy for achieving the electric-filed-induced quantum phase transition.

Electric-field Control of Electronic States in WS2 Nanodevices by Electrolyte Gating

Here, we present a protocol to control the carrier number in solids by using the electrolyte.

A method of carrier number control by electrolyte gating is demonstrated. We have obtained WS2 thin flakes with atomically flat surface via scotch tape ...

A Fabrication and Measurement Method for a Flexible Ferroelectric Element Based on Van Der Waals Heteroepitaxy

Flexible non-volatile memories have received much attention as they are applicable for portable smart electronic device in the future, relying on high-density data storage and low-power consumption capabilities. However, the high-quality oxide based nonvolatile memory on flexible substrates is often constrained by the material characteristics and the inevitable high-temperature fabrication process. In this paper, a protocol is proposed to directly grow an epitaxial yet flexible lead zirconium titanate memory element on muscovite mica. The versatile deposition technique and measurement method enable the fabrication of flexible yet single-crystalline non-volatile memory elements necessary for the next generation of smart devices.

In this paper, we present a protocol to directly grow an epitaxial yet flexible lead zirconium titanate memory element on muscovite mica.

제조 및 반 데르 발스 Heteroepitaxy에 따라 유연한 Ferroelectric 요소에 대 한 측정 방법

Flexible non-volatile memories have received much attention as they are applicable for portable smart electronic device in the future, relying on ...

Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals

Materials showing coupling phenomena between magnetism and (ferro)electricity, i.e., magnetoelectric effects, have attracted a great deal of attention due to their potential applications for future device technologies such as sensors and storage. However, conventional approaches, which usually utilize materials containing magnetic metal ions (or radicals), have a major problem: only a few materials have been found to show the coupling phenomena at room temperature. Recently, we proposed a new approach to achieve room-temperature magnetoelectrics. In contrast to conventional approaches, our alternative proposal focuses on a completely different material, a &#34;liquid crystal&#34;, free from magnetic metal ions. In such liquid crystals, a magnetic field can be utilized to control the orientational state of constituent molecules and the corresponding electric polarization through magnetic anisotropy of the molecules; it is an unprecedented mechanism of the magnetoelectric effect. In this context, this paper provides a protocol to measure ferroelectric properties induced by a magnetic field, that is, the direct magnetoelectric effect, in a liquid crystal. With the method detailed here, we successfully detected magnetically-tuned electric polarization in the chiral smectic C phase of a liquid crystal at room temperature. Taken together with the flexibility of constituent molecules, which directly affects the magnetoelectric responses, the introduced method will serve to allow liquid crystal cells to acquire more functions as room-temperature magnetoelectrics and associated optical materials.

In this report, we present a protocol to examine direct magnetoelectric effects, i.e., induction of ferroelectric polarization by applying magnetic fields, in liquid crystals. This protocol provides a unique approach, supported by the softness of liquid crystals, to achieve room-temperature magnetoelectrics.

액정에 자석으로 조정 Ferroelectric 편광 측정

Materials showing coupling phenomena between magnetism and (ferro)electricity, i.e., magnetoelectric effects, have attracted a great deal of attention due ...

High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal

Smart viscoelastic materials that respond to specific stimuli are one of the most attractive classes of materials important to future technologies, such as on-demand switchable adhesion technologies, actuators, molecular clutches, and nano-/microscopic mass transporters. Recently it was found that through a special solid-liquid transition, rheological properties can exhibit significant changes, thus providing suitable smart viscoelastic materials. However, designing materials with such a property is complex, and forward and backward switching times are usually long. Therefore, it is important to explore new working mechanisms to realize solid-liquid transitions, shorten the switching time, and enhance the contrast of rheological properties during switching. Here, a light-induced crystal-liquid phase transition is observed, which is characterized by means of polarizing light microscopy (POM), photorheometry, photo-differential scanning calorimetry (photo-DSC), and X-ray diffraction (XRD). The light-induced crystal-liquid phase transition presents key features such as (1) fast switching of crystal-liquid phases for both forward and backward reactions and (2) a high contrast ratio of viscoelasticity. In the characterization, POM is advantageous in offering information on the spatial distribution of LC molecule orientations, determining the type of liquid crystalline phases appearing in the material, and studying the orientation of LCs. Photorheometry allows measurement of a material&#8217;s rheological properties under light stimuli and can reveal the photorheological switching properties of materials. Photo-DSC is a technique to investigate thermodynamic information of materials in darkness and under light irradiation. Lastly, XRD allows studying of microscopic structures of materials. The goal of this article is to clearly present how to prepare and measure the discussed properties of a photorheological material.

This protocol demonstrates the preparation of a photorheological material that exhibits a solid phase, various liquid crystalline phases, and an isotropic liquid phase by increasing temperature. Presented here are methods for measuring the structure-viscoelasticity relationship of the material.

트위스트 벤드 네매틱 액정의 고대비 및 빠른 광역학 스위칭

Smart viscoelastic materials that respond to specific stimuli are one of the most attractive classes of materials important to future technologies, such ...

화학

The Effect of Anodization Parameters on the Aluminum Oxide Dielectric Layer of Thin-Film Transistors

Aluminum-oxide (Al2O3) is a low cost, easily processable and high dielectric constant insulating material that is particularly appropriate for use as the dielectric layer of thin-film transistors (TFTs). Growth of aluminum-oxide layers from anodization of metallic aluminum films is greatly advantageous when compared to sophisticated processes such as atomic layer deposition (ALD) or deposition methods that demand relatively high temperatures (above 300 &#176;C) such as aqueous combustion or spray-pyrolysis. However, the electrical properties of the transistors are highly dependent on the presence of defects and localized states at the semiconductor/dielectric interface, which are strongly affected by the manufacturing parameters of the anodized dielectric layer. To determine how several fabrication parameters influence the device performance without performing all possible combination of factors, we used a reduced factorial analysis based on a Plackett-Burman design of experiments (DOE). The choice of this DOE permits the use of only 12 experimental runs of combinations of factors (instead of all 256 possibilities) to obtain the optimized device performance. The ranking of the factors by the effect on device responses such as the TFT mobility is possible by applying analysis of variance (ANOVA) to the obtained results.

Anodization parameters for growth of the aluminum-oxide dielectric layer of zinc-oxide thin-film transistors (TFTs) are varied to determine the effects on the electrical parameter responses. Analysis of variance (ANOVA) is applied to a Plackett-Burman design of experiments (DOE) to determine the manufacturing conditions that result in optimized device performance.

박막 트랜지스터의 알루미늄 산화물 유전체 층에 대한 양극 산화 매개변수의 영향

Aluminum-oxide (Al2O3) is a low cost, easily processable and high dielectric constant insulating material that is particularly appropriate for use as the ...

A Simple and Scalable Fabrication Method for Organic Electronic Devices on Textiles

Today, wearable electronics devices combine a large variety of functional, stretchable, and flexible technologies. However, in many cases, these devices cannot be worn under everyday conditions. Therefore, textiles are commonly considered the best substrate to accommodate electronic devices in wearable use. In this paper, we describe how to selectively pattern organic electroactive materials on textiles from a solution in an easy and scalable manner. This versatile deposition technique enables the fabrication of wearable organic electronic devices on clothes.

In this paper, we present a protocol to selectively deposit organic materials on textiles, which allows for the direct integration of organic electronic devices with wearables. The fabricated devices can be fully integrated in textiles, respecting their mechanical appearance and enabling sensing capabilities.

섬유에 유기 전자 장치를위한 간편하고 확장 가능한 제조 방법

Today, wearable electronics devices combine a large variety of functional, stretchable, and flexible technologies. However, in many cases, these devices ...