ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Guojian Yang,Baige Yang,Weijia Mu,Yinghao Ge,Yiru Cai,Zhiqiang Yao,Zhaoyu Ma,Yu-Mo Zhang,Sean Xiao-An Zhang
Due to the high energy efficiency and a wide range of potential applications in daily life, bistable electrochromic devices (BECDs) have gained extensive attention in recent years. However, poor bistability and slow response rate are the main barriers, which restrict the development of BECDs. Herein, a transparent multidimensional electrode with indium tin oxide (ITO) nanofibers and gold nanoparticles was fabricated to improve both the bistability and responsiveness of devices. Its criss-crossed ITO nanofibers with high length-to-diameter ratios to reduce the distance of heterogeneous electron transfer and its gold nanoparticles to form a stable Au–S bond to avoid self-erasing of electrochromic materials have been demonstrated and discussed systematically. This device based on the transparent multidimensional working electrode had a shorter response time (1/5) and a longer bistability (12/1) compared with the prototype devices based on common fluorine-doped tin oxide electrodes. Besides, this device had a promising electrochromic performance with a high coloration efficiency of 448.27 cm2/C and a switching stability with no significant attenuation after 1200 cycles.
研究领域:
材料科学
·
纳米技术
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
OPTICAL MATERIALS
·
2023
·
IF 3.9
Xiaoshuai Li,Meishan Zhang,Chi Zhang,Rui Niu,Hongmei Ma,Yubao Sun
Bistable liquid crystal devices, which require electricity only at the switching processes of the two states, have advantages in energy saving and safety compared with monostable liquid crystal devices. Due to electrohydrodynamic and dielectric effects, the ion-doped cholesteric liquid crystal can switch between a focal conic state and a planar state with different frequencies of the driving voltage. However, the cholesteric liquid crystal that self-assembles from the dynamic scattering state always has a poor focal conic state, resulting in a low contrast ratio. This paper presents a bistable polymer-stabilized ion-doped cholesteric liquid crystal device. The introduction of a small amount of polymer network can greatly enhance the light scattering capabilities of the focal conic state, endowing the device with excellent electro-optic performance. The electro-optical properties of the device are investigated with the various content of monomer and chiral dopant , and rotational viscosity of liquid crystal. Liquid crystal with a low rotational viscosity coefficient is beneficial to the formation of a good polymer network. The pitch induced by chiral dopant impacts the formation process of the polymer network, which subsequently affects the electro-optical properties. The bistable device has a low driving voltage and a high contrast ratio, making it ideal for use in smart windows.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2017
·Vol. 6
·期 2
·388-392
·
IF 5.256
Yaoguo Shen,Sangen Zhao,Chenxi Wang,Zujian Wang,Jianghe Feng,Maochun Hong,Junhua Luo
Bistable compounds have attracted intensive interest because of their great potential to realize seamless integration of multifunctional switches in one device. However, previous studies are mainly limited to organic–inorganic hybrid compounds, which have relatively low phase-transition temperature and thermal stability. Here, we report a new pure inorganic compound CsCdPO4, which undergoes a high-temperature phase transition at 447 K. Correspondingly, CsCdPO4 simultaneously shows an interesting duple bistability of nonlinear optical and dielectric properties. Furthermore, it shows an extremely high thermal stability up to 1418 K, which is significantly higher than those of organic–inorganic bistable compounds. This work will open up a new avenue to develop multifunctional materials that remain stable even under extreme operating conditions (e.g. extremes of temperature).
研究领域:
材料科学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Science
·
2024
·Vol. 11
·期 26
·2402824
·
IF 14.3
Chen Fei Dai,Qing Li Zhu,Olena Khoruzhenko,Michael Thelen,Huiying Bai,Josef Breu,Miao Du,Qiang Zheng,Zi Liang Wu
Creatures, such as Venus flytrap and hummingbirds, capable of rapid predation through snap-through transition, provide paradigms for the design of soft actuators and robots with fast actions. However, these artificial “snappers” usually need contact stimulations to trigger the flipping. Reported here is a constrained anisotropic poly( N -isopropylacrylamide) hydrogel showing fast snapping upon light stimulation. This hydrogel is prepared by flow-induced orientation of nanosheets (NSs) within a rectangular tube. The precursor containing gold nanoparticles is immediately exposed to UV light for photopolymerization to fix the ordered structure of NSs. Two ends of the slender gel are clamped to form a buckle with bistability nature, which snaps to the other side upon laser irradiation. Systematic experiments are conducted to investigate the influences of power intensity and irradiation angle of the laser, as well as thickness and buckle height of the gel, on the snapping behaviors. The fast snapping is further used to kick a plastic bead and control the switch state. Furthermore, synergetic or oscillated snapping of the gel with two buckles of opposite directions is realized by inclined irradiation of a laser or horizontal irradiation with two lasers, respectively. Such light-steered snapping of hydrogels should merit designing soft robots, energy harvests, etc.
研究领域:
软体机器人
·
材料科学
·
仿生学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SOLID-STATE ELECTRONICS
·
2016
·
IF 1.345
Xu Li,Yue Lu,Li Guan,Jiantao Li,Yichao Wang,Guoyi Dong,Aiwei Tang,Feng Teng
Hybrid organic/inorganic electrically bistable devices (EBDs) based on Cu 2 S/PVK nanocomposites have been fabricated by using a simple spin-coating method. An obvious electrical bistability is observed in the current-voltage ( I - V ) characteristics of the devices, and the presence of the buffer layer and the annealing process have an important effect on the enhancement of the ON/OFF current ratios. Different electrical conduction mechanisms are responsible for the charge switching of the devices in the presence and absence of the buffer layer.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2018
·Vol. 47
·期 7
·2344-2351
·
IF 4.099
Xiao Zhu,Wan-Ying Zhang,Cheng Chen,Qiong Ye,Da-Wei Fu
Photoelectric dual-function features in bulk crystals or flexible thin films make them excellent candidates for important and thriving applications in storage, sensing and other information fields. Based on superior advantages such as easy and environmentally friendly processing, mechanical flexibility, and ability to fabricate films and bulk single crystals; we designed a type of molecular material with a photoelectric multi-function switch, [N(NH2CH2CH2)3]2Mn2Cl12 (compound 1), which exhibits intriguing temperature-dependent dielectric and red emission switchable characteristics. This material perfectly explains the advantages of molecular materials, while 1 can also be used to fabricate a transparent unidirectional film with ultra-flexibility. Moreover, this material shows the highest record in signal contrast of ∼5 (exceeding all the known molecular materials/crystalline switches, revealing its potential to obtain high-efficiency signal-to-noise ratio), sensitive dielectric bi-stability, and excellent switching anti fatigue. These features give it a high application value in integrated circuits, optoelectronic seamless integration devices and flexible multifunctional devices.
研究领域:
材料科学
·
光电子学
·
信息存储与传感
✓ 已验证
DOI
PubMed
高影响因子
MATERIALS & DESIGN
·
2018
·
IF 4.525
Mei Chen,Xiao Liang,Wei Hu,Lanying Zhang,Cuihong Zhang,Huai Yang
In this paper, we promote a new polymer microsphere-filled cholesteric-liquid crystal (PFLC) system sandwiched between two flexible substrates for making a robust composite film with both bistable optical performance and high mechanical strength . The effects of the size of the polymer microspheres (PMs) and the pitch of the cholesteric liquid crystals (ChLCs) on the electro-optical performance of the as-made PFLC films were systematically investigated. Results show that the optical appearance of the optimized PFLC film can be reversibly changed between transparent and light-scattering states according to electric field by switching the ChLCs between planar (P) and focal conic (FC) states. Moreover, both P and FC states are stable for more than one year after removing the electric field, which is due to the great reduced polymer specific surface area of 1.78 m 2 /g and the spatial hindrance from the in situ thermally polymerized PMs, respectively. Aside from the long-term optical stability, the high content of the densely packed PMs also endows the PFLC film with a satisfactory shearing strength of 206.0 kPa between the top and bottom substrates, showing great potential applications in a wide range of uses, such as smart windows , electronic paper or writing tablets.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2022
·Vol. 13
·期 1
·1-9
·
IF 17.694
Fu Qianqian,Yu Wenyuan,Bao Guangyang,Ge Jianping
Electrically responsive photonic crystals are promising materials for electrophoretic color displays with better brightness and color saturation. However, electric field must always be applied to maintain the specific colors, which brings concerns about the power consumption and signal stability and reversibility. Here, we show an electrically responsive photonic crystal with two stable states at 0 V, which are the colored state or the colorless state with ordered or disordered particle arrangement. The color state can be reversibly switched by applying a short-time electrical field, just like in the case of commercial electrophoretic ink. With optimized recipe and electric field, the photonic crystals encapsulated in the prototype display panel are proved to have potentials in high resolution, multi-color, and greyscale display, which lays down a firm basis for reflective displays with low power consumption and good visibility.
研究领域:
材料科学
·
显示技术
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2024
·
IF 6.3
Le Huy Thai,Le Thi Thanh Nhi,Truong Chau Giang,Le Van Quyet,Nguyen Minh Hiep,Tran Quang Hung,Le Hoang Sinh
A highly bistable viologen-based electrochromic display was successfully developed by using a simple strategy with cheap commercial phenol-based epoxy. By adding epoxy, phenol species can contribute a dual effect, in which they can play as electron shuttles to facilitate fast coloration of ECDs and stabilize the long bistability of ECDs through the proton-coupled electron transfer (PCET) mechanism during coloration state. With the use of epoxy, CPHEV 2+ /E exhibits an improvement of maximum ΔT, which is 78.6 % at 596 nm compared to 53 % for that of ECD without epoxy. The ECD with added epoxy can hold the colored state up to 50 h after applying a voltage of −2.5 V for 15 s compared with ECD without epoxy which is 22 min. Notably, the color state undergoes decomposition to 10 % of its initial value after 3.5 h without any extra power supply. The 3D-printed rose flower ECD was successfully demonstrated using digital light processing (DLP) with good dimensional accuracy and resolution.
研究领域:
材料科学
·
电化学
·
光电技术
·
显示技术
✓ 已验证
产品关联
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2023
·Vol. 25
·期 33
·22325-22335
·
IF 3.3
Huimin Zhang,Fei Li,Junqin Li,Zemin He,Jianjing Gao,Lifen Wen,Yuzhen Zhao,Zongcheng Miao
Bistable cholesteric liquid crystals have promising application prospects in various fields, such as smart windows and displays. However, the long-term stability of two individual states is not easy to achieve, hindering their practical use. In this research, the bistable feature was enhanced by constructing a microsphere-type polymer with a liquid-crystalline epoxy/thiol monomer in negative dielectric anisotropic cholesteric liquid crystals. Spectroscopic and optical examinations revealed that either the transparent planar state or the opaque focal conic state can be maintained without the aid of an external field. Moreover, they can be switched to each other by applying a high- or low-frequency electric field. Further, factors such as the chemical structure of thiol compounds, curing temperature and curing time were investigated to explore their influences on the micro morphology of the polymer and thereby the electro-optical properties. In addition, the frequency-dependent driving scheme was analysed. Finally, bistable switching was demonstrated using an optimized sample. This energy-efficient bistable film shines light on future applications in smart windows, photonic paper and other electro-optical devices.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED MATERIALS
·
2023
·Vol. 35
·期 15
·2211802
·
IF 29.4
Chen Yu Li,Dejin Jiao,Xing Peng Hao,Wei Hong,Qiang Zheng,Zi Liang Wu
Joints, as a flexing element to connect different parts, are widespread in natural systems. Various joints exist in the body and play crucial roles to execute gestures and gaits. These scenarios have inspired the design of mechanical joints with passive, hard materials, which usually need an external power supply to drive the transformations. The incorporation of soft and active joints provides a modular strategy to devise soft actuators and robots. However, transformations of responsive joints under external stimuli are usually in uni-mode with a pre-determined direction. Here, hydrogel joints capable of folding and twisting transformation in bi-mode are reported, which enable the composite hydrogel to form multiple configurations under constant conditions. These joints have an in-plane gradient structure and comprise stiff, passive gel as the frame and soft, active gel as the actuating unit. Under external stimuli, the response mismatch between different gels leads to out-of-plane folding or twisting deformation with the feature of bistability. These joints can be modularly integrated with other gels to afford complex deformations and multistable configurations. This approach favors selective control of hydrogel's architectures and versatile design of hydrogel devices, as demonstrated by proof-of-concept examples. It shall also merit the development of metamaterials, soft actuators, and robots, etc.
研究领域:
材料科学
·
软体机器人
·
智能材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DYES AND PIGMENTS
·
2022
·
IF 5.122
Yuewei Zhang,Xuchao Jin,Weiran Zhang,Chang Gu,Xuesong Liu,Yu-Mo Zhang
A bistable electrochromic device based on poly(viologen)s is demonstrated with good overall performance, including bistability (4981 s), switch-on voltage (−1.0 V) and reversibility (≥1000 cycles). Overall, these results imply that the control of the diffusivity of viologens is an effective methodology for achieving excellent bistability and low energy consumption.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）