Coatings
·
2021
·Vol. 11
·期 10
·1178
·
IF 2.881
Min Zhang,Zhenjiang Li,Yunfei Zhao,Zhaofeng Wu,Jun Zhang,Linyu Yang,Shuying Wang,Shiqing Li
In this study, ultraviolet detectors based on NaTaO3/TiO2were fabricated with enhanced detection performance towards solar-blind (200–280 nm) light. A TiO2seed layer was introduced and served as a buffer layer between the fluorine tin oxide (FTO)-coated glass substrate and the TiO2film, which increased the adhesion between them. The periodic stability and photoelectric characteristics of the detectors were studied and analyzed. The detectors showed a high performance when illuminated by 265 nm and 254 nm UV light. At −15 V bias, the dark current of the detector was only 70 pA. Under the bias of −15 V and the illumination of 254 nm, the maximum photo-to-dark current ratio reached 20, and the response time was less than 300 ms. Moreover, the detector exhibited a fast response time and remained very stable after numerous testing cycles. These results demonstrate the potential application of NaTaO3/TiO2composites in UV detection.
研究领域:
材料科学
·
光电子学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2024
·
IF 5.5
Lirong Chen,Jieyuan Zheng,Xiaoli Chen,Yang Zheng,Xingru Wang,Rui Ge,Chengyu Jiang,Gang Xu,Liuwen Zhong,Yanqing Zhu,Xiudi Xiao
Response time (τ, defined as the time required for 90% change in the full transmittance modulation, including coloring time τ c and bleaching time τ b ) is an important evaluation index for the performance of electrochromic (EC) materials, and it can directly reflect the microscopic rate of EC process. However, the research on the internal relationship between the response time and the process of electrochemical dynamics is rare. Herein, by controlling the thickness of the WO 3-x EC film, a complete reversal of the response time (from τ c > τ b in the thinner film to τ b > τ c in the thicker film) is observed. Based on the detailed analysis of the characteristics presented in electrochemical impedance spectroscopy (EIS), especially focusing on the changing trend about the arc of different frequency ranges and the slope value of the linear part, it can be found that this reversal is due to the change of the main dynamics process from surface capacitive-controlled to bulk diffusion-controlled with the increase of WO 3-x film thickness. Meanwhile, this change with obvious film thickness dependence requires a "trigger", which is reflected by the bleaching threshold potential. Besides, this study reveals the three stages of the EC coloring process from the perspective of dynamics, including the lithium-ions (Li-ions) adsorption charge layer, surface Faraday process, and bulk Faraday process, which also show significant film thickness dependence. The result of this work is beneficial to modulate the balance of response time and to improve the performance of EC films.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ChemElectroChem
·
2018
·Vol. 5
·期 10
·1407-1414
·
IF 4.446
Yun Su,Fei Yang,Lijuan Zhou,Yong Geng,Jianming Zhang,Min Jiang
Graphical Flexible and friendly : A free-standing film was fabricated using a mixture of cellulose nanocrystals (CNCs), viologen, and KCl. The viologen/KCl/CNCs film was sandwiched between two ITO glasses to construct the viologen-based electrochromic devices (ECDs). ECDs based on four kinds of viologens with different substituent groups show different driving voltages and distinct coloration response. The performance of the viologen-based ECDs does not depend on any organic solvent. This work benefits the development of sustainable and environmentally friendly viologen-based ECDs for the application in optical displays. The new, sustainable, and pro-environmental electrochromic devices (ECDs) have attracted tremendous attention due to the current issues regarding energy sources consumption and environmental pollution. A free-standing composite film, consisting of cellulose nanocrystals (CNCs) as biological matrix, viologen, and KCl, was prepared by a casting method. Such a composite film is flexible and can be tailored into various shapes for patterned applications. The viologen/KCl/CNCs film was sandwiched between two indium-tin oxide (ITO) glasses to construct viologen-based ECDs. The performance of the viologen-based ECDs did not depend on the organic solvent. ECDs based on four kinds of viologens with different substituent groups exhibited distinct coloration response. Besides the nature of the substituent groups attached to the bipyridine rings, the presence of CNCs is a crucial factor that affects the electrochromic performance of ECDs. The dimethyl-substituted viologen ECD has a fast response time (10 s for bleaching and 7.3 s for coloring). And for the dibenzyl-substituted viologen, a low voltage of −2.2 V can drive the coloration of its ECDs. The diethyl-substituted viologen ECD exhibits 30 % transmittance variation and good coloring/bleaching stability. The ability to be tailored and degradability of the composite film provides a feasible strategy for the sustainability of electrochromic displays.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 29
·期 13
·11178-11186
·
IF 2.324
Cheng Yali,He Yue,Li Shuo,Wang Yifang,Zhao Yan,Li Yu,Li Haiying,Liu Li
In the present work, the acetone gas sensing material based on pure α-Fe 2 O 3 nanotubes, pure and Cu-doped α-Fe 2 O 3 porous nanotubes were fabricated by electrospinning and annealing processes. Different Cu dopant concentrations are introduced to investigate the dopant’s role in sensing performance. The structures and chemical compositions of the as-prepared products were examined using a series of material characterization methods including XRD, EDS, SEM and nitrogen adsorption–desorption analysis. And the acetone sensing results demonstrate that the gas sensitivity of porous nanotubes is better than nanotubes. Moreover, compared with pure samples, the sensor based on 3.0 wt% Cu-doped α-Fe 2 O 3 porous nanotubes exhibits higher response (99.43/100 ppm) and excellent selectivity towards acetone at 164 °C. Meanwhile, the detection limit can extend down to ppb level (2.2/100 ppb). Additionally, the sensor also shows fast response and recovery time (5/18 s) and good repeatability to acetone. The enhancement of gas sensitivity is ascribed to not only the effective utility of hollow and porous structures, but also the high catalytic activity of the Cu additive.
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2024
·
IF 5.3
Yu Chang,Jianan Zhang,Ivan S. Babichuk,Hailong Liu,Yijie Liu,Jian Yang
The release of ammonia (NH 3 ) in industry or daily life is harmful to human health. A gas sensor was developed using h -MoO 3 nanorods and graphene film to detect and eliminate this. The h -MoO 3 nanorods were first synthesized by chemical bath deposition using ammonium molybdate tetrahydrate (NH 4 ) 6 Mo 7 O 24 •4H 2 O and HNO 3 and then deposited on the graphene film transferred to SiO 2 /Si substrate by electrochemical bubbling method. Subsequently, gas-sensitive h -MoO 3 @Graphene composite films were prepared and analyzed using Raman, XRD, SEM, and UV–vis. The gas sensor's performance was evaluated to detect NH 3 at a room temperature concentration range of 1–60 ppm. Compared with graphene, the conductivity of the composite film with 10 mg/ml h -MoO 3 nanorods was increased by 40 % and the sensitivity increased by 10 times. The sensor h -MoO 3 @G-10 showed the best sensing performance to 1 ppm NH 3 . Sensor sensitivity, response and recovery time are 1.1 %, 46.8 s and 17.8 s.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
INFRARED PHYSICS & TECHNOLOGY
·
2022
·
IF 2.997
Song Li,Yufei Zhai,Xiaoying Pan,Ying Jin,Min Wang
The accurate temperature measurement with micrometric spatial resolution is difficult to acquire by using conventional contact thermal probes. Noncontact thermal probes possess great potential for future high resolution accurate temperature measurements. Herein, we report a thermometer based on Ruphen-based temperature sensitive paint (TSP) for high-sensitive remote temperature measurement. TSP consisting of Ruphen and PVDF with sharp emission band and high internal quantum efficiency was designed and employed to fabricate a luminescence thermometer prototype for infrared-to-visible converter in this study. The temperature dependent photoluminescence properties of the different Ruphen/PVDF films were analyzed in the range of 283 K to 363 K, and a relatively high thermal sensitivity (−4.3 %K −1 @ RT) was obtained for low Ruphen concentration sample. The as-fabricated temperature sensor prototype can detect a 623 K thermal object with a response time of 1.52 s and a noise equivalent temperature difference ( NETD ) of 2.40 K. Furthermore, the effect of IR absorber on the imaging performance was also investigated, and an optimized response time of 1.17 s and NETD of 1.68 K were observed. The results indicate that Ruphen/PVDF film is promising for a luminescence thermometer for room temperature mapping.
研究领域:
材料科学
·
光学工程
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
Optics Continuum
·
2023
·Vol. 2
·期 3
·554-563
·
IF 0
Shiqing Zhao,Wenwen Xu,Yanhua Liu
Flexible electrochromic devices (ECDs) are a future technology with huge impact on wearable displays, energy saving, and adaptive camouflage. In this work, we used embedded nickel (Ni) mesh transparent electrodes combined with a thin polymer film of poly(3,4-ethylenedioxythiophene): polystyrene sulfonate (PEDOT:PSS) to build a multifunctional flexible electrochemical device that integrates the functions of electrochromic and supercapacitor devices. The multi-layer architecture improves the device performance in terms of optical contrast and mechanical strength. Ni-mesh electrodes have a high optical transparency (84.8%), good mechanical flexibility, and low resistance (0.5 Ω/sq), which is conducive to efficient electron injection, benefiting to the response time of the constructed device. The thin polymer film of PEDOT:PSS is an electrochromic (EC) material that also uniformly distributes electrons for a uniform coloration. The fabricated device shows fast response to coloring and bleaching (1.2 and 0.8 s, respectively), an absolute transmittance contrast ratio of 40%, and area capacitance of up to 2.48 mF/cm2. Furthermore, the device exhibits excellent flexibility, and the electrochromic and electrochemical properties of the device are only partially diminished upon folding, which is beneficial for the construction of multifunctional flexible electrochromic devices. With its response time, working stability, and bending ability, our multifunctional device paves the way for the next generation of flexible electronics.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Liwen He,Zongmin Li,Yuan He,Xinjie Tao,Bizhou Lin,Jun Chen,Qiao Huang,Dongya Sun
The study of electrochromic materials has far-reaching significance for the regulation of light and heat as well as the reduction of energy consumption. In this study, rGO-Co-NiO composite films were prepared by combining graphene oxide , which has excellent conductivity and stability, with Co-NiO films. The particle size, band gap, conductivity and response time of the electrochromic films were improved by precisely adjusting the component modulation amount of graphene oxide. The results show that with the incorporation of GO it is easy to form oxygen vacancies , which is conducive to ionic conduction and diffusion, in which the film with a GO doping concentration of 4 % has excellent performances in terms of response time and coloring efficiency, and the response time is reduced from 10.2 to 5.8 seconds, and it still possesses 57.25 % of the light modulation amplitude after 600 cycles, of which the attenuation rate is only 2 % for the period from 100 to 600 cycles, The coloring efficiency after 100 cycles is 48.21 cm 2 /C. In summary, the investigated rGO-Co-NiO composite films have a broad potential for future application in electrochromic devices .
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
Research
·
2024
·
IF 8.5
Weiwei Li,Lingyan Kong,Manzhang Xu,Jiuwei Gao,Lei Luo,Yingzhe Li,Kexin Wang,Yilin Zhou,Lei Li,Yuan Wei,Xiaoshan Zhang,Ruoqing Zhao,Mengdi Chen,Yuting Yan,Xiaoguang Luo,Zhaohe Dai,Lu Zheng,Xuewen Wang,Wei Huang
Real-time thermal sensing through flexible temperature sensors in extreme environments is critically essential for precisely monitoring chemical reactions, propellant combustions, and metallurgy processes. However, despite their low response speed, most existing thermal sensors and related sensing materials will degrade or even lose their sensing performances at either high or low temperatures. Achieving a microsecond response time over an ultrawide temperature range remains challenging. Here, we design a flexible temperature sensor that employs ultrathin and consecutive Mo1−xWxS2 alloy films constructed via inkjet printing and a thermal annealing strategy. The sensing elements exhibit a broad work range (20 to 823 K on polyimide and 1,073 K on flexible mica) and a record-low response time (about 30 μs). These properties enable the sensors to detect instantaneous temperature variations induced by contact with liquid nitrogen, water droplets, and flames. Furthermore, a thermal sensing array offers the spatial mapping of arbitrary shapes, heat conduction, and cold traces even under bending deformation. This approach paves the way for designing unique sensitive materials and flexible sensors for transient sensing under harsh conditions.
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
IEEE SENSORS JOURNAL
·
2024
·
IF 4.3
Zhiyan Ma,Yaping Song,Hongran Zhao,Sen Liu,Xi Yang,Teng Fei,Tong Zhang
In this study, imidazole-based poly(ionic liquid)s (PILs) are introduced into acid-treated mesoporous silica by solid grinding and subsequent thermal polymerization methods. The purpose of treating mesoporous silica with hydrochloric acid is to increase the number of hydroxyl groups on the surface to fix more PILs. Because of the synergism of enhanced hydrophilicity and the mesoporous structure, the synthesized composite materials exhibited excellent capacities to adsorb and transport water vapor molecules and are suitable for low-humidity sensing applications. In the 7%–33% relative humidity (RH) range, the response of the as-prepared sensor reached 806% with a short response/recovery time of 8/13 s.
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Jiazi Shi,Chen Liu,Meichen Lin,Yabo Fu,Diangang Wang,Jing Song,Gaimei Zhang,Hui Liu,Lanlan Hou
In this work, graphene oxide (GO) nanosheets modified with TiO 2 nanoparticles were prepared by a simple solution ultrasonication method. The GO/TiO 2 nanocomposites were successfully synthesized by in-situ oxidation of Ti 3 C 2 T x nanosheets on the surface of GO nanosheets . It is revealed that spindle-shaped TiO 2 nanoparticles are uniformly distributed on the GO nanosheets, which will provide more active sites for NH 3 adsorption. The response of NH 3 sensor based on GO/TiO 2 nanocomposites to 100 ppm NH 3 at room temperature is approximately twice that of pure GO, which may be attributed to its unique structure and GO/TiO 2 heterojunction . The GO/TiO 2 sensors also demonstrated good stability, ideal repeatability, great selectivity , and a quick response/recovery time of 13/33 s. Lastly, density-functional theory (DFT) was used to examine the adsorption behavior and charge transfer capacity between NH 3 molecules and the materials. The results indicate that the GO/TiO 2 nanocomposites are potentially useful materials for highly sensitive NH 3 detection at room temperature.
研究领域:
材料科学
·
化学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
RARE METALS
·
2025
·
IF 11
Yang Fan,Zhang Jun-Ning,Zhang Chao,Xu Xin-Da,Li Bing,Yang Woochul,Xie Wan-Feng
Real-time detection of acetic acid vapor is of concern for ensuring environmental and personal safety. However, acetic acid gas sensors, particularly those based on Bi 2 O 3 , often fail to meet practical performance requirements owing to their slow response characteristics and high operating temperature. To enhance sensing performance, highly permeable Bi 2 O 3 microspheres decorated by Pt-nanoparticles are rationally synthesized by a facile template method. Among the fabricated sensors, the one based on 3 wt% Pt-decorated Bi 2 O 3 demonstrated excellent sensing performance. Specifically, the sensor displayed high selectivity for acetic acid, rapid response and recovery times (22.5 and 9 s, respectively), strong resistance to interference, and good long-term stability at a low operating temperature (150 °C). Notably, the sensor exhibited an exceptionally high response of 126 to 100 ppm acetic acid—the highest reported value for Bi 2 O 3 -based sensors tested at a relatively low operating temperature in recent years. These results demonstrate that Pt-decorated Bi 2 O 3 holds strong potential for use in high-performance acetic acid sensors. Graphical abstract
研究领域:
材料科学
·
纳米技术
·
环境监测
·
化学传感
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）