MATERIALS LETTERS
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2024
·
IF 2.7
Peng Wang,Chengli Tang
Conductive polymer-based ammonia gas sensors show advantage in room-temperature response. Polyaniline (PANI)-based ammonia gas sensors were prepared by drop-coating and aerosol-jet printing methods and tested for their ammonia gas sensing properties. The aerosol-jet-printed sensor shows significantly shortened response and recovery time for ammonia sensing. Morphological observations were carried out to investigate the mechanism of the improvement. The crystalline form of PANI was found to transfer in the aerosol-jet printing process and play the critical rule in the ultra-fast response and recovery of the sensor.
研究领域:
材料科学
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传感器技术
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yike Zhang,Dongqi Liu,Zichen Ren,Wenchao Liu,Bo Wang,Shanshan Song,Tingting Hao,Lei Xu,Haoyu Ji,Jiawu Sun,Leipeng Zhang,Yao Li
Electrochromic devices (ECDs) based on polyaniline (PANI) can alter their optical properties reversely by varying applied voltages, showing great potential in infrared (IR) information concealment. However, the traditional ECD with a flat PANI layer tends to perform unsatisfactorily in IR emissivity regulation and response time, resulting in risks of information leakage and low transfer efficiency. To address these challenges, a wrinkled microstructure is incorporated into the PANI layer (PANI-W) of the ECD (ECD-W) through a self-wrinkling method. Theoretic simulations combined with experimental results verify that the PANI-W endows an enhanced antireflection effect and a more complete redox degree. As a result, the ECD-W exhibits an exceptional IR emissivity modulation (0.375) and a short response time (1.8 s/2.6 s), allowing it to realize a temperature modulation of 8.9 °C. Moreover, various patterned and anti-patterned ECDs-W are feasibly prepared without masks, and more complicated patterns can be realized by erasing the unnecessary part of PANI-W on the ECDs-W. Two encryption/decryption strategies based on these ECDs-W are presented to provide more secure ways for IR information concealment. This research offers guidance to achieve high-performance ECDs with more effective spectrum regulation and faster responses, showing great potential in thermal regulation and IR information protection.
研究领域:
材料科学
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光学工程
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信息保护
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产品关联
DOI
高影响因子
Heliyon
·
2023
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IF 4
Xin Jiang,Weilong Zhou,Wei Wang,Zichun Le,Wen Dong
Miniaturized and pure static devices are expected to be used in laser-imaging systems for speckle reduction. In this study, a pure static device based on polymer-stabilized liquid crystal (PSLC) doped with Ag nanowires was developed to effectively suppress laser speckles. The concentrations of the polymer and Ag nanowires in the PSLC were optimized, and then the PSLC devices were fabricated. A measurement system was set up to characterize the electro-optical properties of the fabricated PSLC devices. Subsequently, a laser projection system was built to demonstrate the speckle-reduction performance. Moreover, the degree of scattering and response time of the developed PSLC devices were investigated and discussed. A PSLC doped with 0.02 wt% Ag nanowires and 3 wt% polymer having a device size of 2 × 2 × 0.1 cm 3 was demonstrated to produce a speckle-reduction efficiency of 51.4 % under very low driving voltages. The experimental results verified effectiveness and superiority of the developed speckle reduction method based on PSLC doped with Ag nanowires.
研究领域:
光学材料
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显示技术
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纳米科技
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2021
·
IF 7.46
He Yu,Jun-Ge Liang,Cong Wang,Cheng-Cai Liu,Bing Bai,Fan-Yi Meng,Dan-Qing Zou,Luqman Ali,Chang-Qiang Jing,Meng Zhao,Lei Wang,Xiao-Feng Gu
Optimized hygroscopic film preparation and high-precision manufacturing guarantee the humidity sensor expected properties on sensitivity, hysteresis, response/recovery speed, reliability, etc. This paper demonstrated a comprehensive prioritization scheme on the premise of industrial production. Raw materials mixtures such as pyromellitic dianhydride (PMDA)/p-phenylenediamine (p-PDA), and PMDA/oxydianiline (ODA) were investigated to solve the issue of film surface collapse. Polyacrylonitrile (PAN) is adopted as an additive to enhance the film reliability (maximum of 0.15 % measurement error rate in 120 h continuous testing) as well as assistance in the film coating process. Rutile TiO 2 with the average particle size of 0.33 μm was employed as doping elements to reduce the hysteresis to 0.95 % relative humidity (RH), increase the sensitivity to 0.94 pF/% RH, and limit the response/recovery time within 40 s. The film-growth quality and the consistency of production performance were assured by the integrated-passive-device (IPD) fabrication process.
研究领域:
材料科学
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传感器技术
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2020
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IF 4.65
Cong Zheng,Cheng Zhang,Lifang He,Kui Zhang,Jian Zhang,Ling Jin,Abdullah M. Asiri,Khalid A. Alamry,Xiangfeng Chu
ZnFe 2 O 4 /ZnO nanosheets assembled microspheres (ZnFe 2 O 4 /ZnO SAS) were successfully constructed by hydrothermal synthesis of ZnO nanosheets assembled microsphere and subsequent growth of ZnFe 2 O 4 nanoparticles on it via a facile solution method. The morphologies and components of as-synthesized ZnFe 2 O 4 /ZnO SAS composites were varied with growth time, and ZnFe 2 O 4 /ZnO SAS composite with the growth time of 30 min (ZnFe 2 O 4 /ZnO SAS30) consisted of porous nanosheets assembled by small ZnFe 2 O 4 and ZnO nanoparticles. The composites were applied as sensing film for trimethylamine (TMA) sensing. ZnFe 2 O 4 /ZnO SAS30 based sensor exhibited good selectivity and higher response to TMA than that of sensors based on bare ZnO microspheres precursor, ZnO/ZnFe 2 O 4 nanoparticle composite and other ZnFe 2 O 4 /ZnO SAS composites, respectively. At 240 °C, the ZnFe 2 O 4 /ZnO SAS30 based sensor exhibited 31.5–100 ppm TMA with a quick response and recovery time of 3.1 s and 5.7 s, respectively, and even as low as 0.1 ppm TMA can be detected. Meanwhile, the corresponding cycling performance and stability was also checked. Such favorable comprehensive sensing performance of ZnFe 2 O 4 /ZnO SAS30 to TMA was attributed to its unique hierarchical structure and ZnO/ZnFe 2 O 4 heterojunctions . All results enabled potential applications of ZnFe 2 O 4 /ZnO SAS30 composite in TMA sensing.
研究领域:
材料科学
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化学传感器
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纳米技术
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产品关联
DOI
高影响因子
MACROMOLECULAR RAPID COMMUNICATIONS
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2022
·Vol. 44
·期 6
·2200831
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IF 5.006
Yuqian Guo,Xianhui An,Xueren Qian
The authors are motivated to develop a series of hydrochromic copolymers with fast response, reversibility, repeatability, and visual transparency transition. The hydrochromic block copolymers are based on the rational ratio of hydrophilic segments of poloxamer block and hydrophobic segments of ethyl cellulose according to the preparation method of polyurethane. By tuning the ratio of hydrophilic segments or adding hygroscopic salts, the hydrochromic polymer is endowed with the ability to visualize the transparency in response to the relative humidity. Especially, the response time of the polymer is extremely shortened, up to 1 s for the optimized sample. Within the moisture stimulation, the hygroscopic swelling increases the film thickness, leading to a reversible transparency switching from a highly transparent state (82%) to an opaque white state (20.5%).
研究领域:
材料科学
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高分子化学
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产品关联
DOI
PubMed
高影响因子
ADVANCED MATERIALS
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2023
·Vol. 35
·期 41
·2304420
·
IF 29.4
Panwang Guo,Bin Tian,Jing Liang,Xiuping Yang,Guilin Tang,Quancai Li,Qun Liu,Ke Zheng,Xiong Chen,Wei Wu
The utilization of printing techniques for the development of high-performance humidity sensors holds immense significance for various applications in the fields of the Internet of Things, agriculture, human healthcare, and storage environments. However, the long response time and low sensitivity of current printed humidity sensors limit their practical applications. Herein, a series of high-sensing-performance flexible resistive-type humidity sensors is fabricated by the screen-printing method, and hexagonal tungsten oxide ( h -WO 3 ) is employed as the humidity-sensing material due to its low cost, strong chemical adsorption ability, and excellent humidity-sensing ability. The as-prepared printed sensors exhibit high sensitivity, good repeatability, outstanding flexibility, low hysteresis, and fast response (1.5 s) in a wide relative humidity (RH) range (11–95% RH). Furthermore, the sensitivity of humidity sensors can be easily adjusted by altering the manufacturing parameters of the sensing layer and interdigital electrode to meet the diverse requirements of specific applications. The printed flexible humidity sensors possess immense potential in various applications, including wearable devices, non-contact measurements, and packaging opening state monitoring.
研究领域:
材料科学
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物联网
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传感技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2023
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IF 3.3
Xiaoyan Xiong,Siyi Li,Lijiu Cao,Yunpeng Gong,Xueting Yu,Jiyao Zhang,Yufang Chen,Tao Jin
Molecular responsive materials with fast, stable, and specific selectivity are a key focus of chemical sensor technology research. In the field of triethylamine (TEA) sensor technology, developing TEA-selective responsive materials with superior performance is of great significance for promoting technological progress and industrialization of TEA sensor technology. In this study, MXene/In 2 S 3 micro-nano powder was prepared by combining Ti 3 C 2 Tx-type MXene with nano-sized In 2 S 3 . The morphology, structure, and structure-performance relationship of the material were characterized and analyzed using SEM, TEM, XRD, HAADF, and XPS. Through experiments, it was confirmed that MXene/In 2 S 3 exhibited outstanding specific selectivity to TEA. At a TEA concentration of 20 ppm and a temperature of 210 °C, the response value of the material to TEA was 8.74, while other typical gas molecules such as aldehydes, ketones, and aromatics showed almost no response, demonstrating excellent selectivity for TEA molecules. The response/recovery time was 19 s/42 s, and the response value was stable over 20 consecutive cycles, indicating excellent reliability of the material. In addition, in the concentration range of 1–500 ppm, the response value of the MXene/In 2 S 3 material to TEA concentration followed an exponential fitting of the asymptotic model, with the formula y = a-b*c x and R 2 of 0.99472. Furthermore, the selection and response process of MXene/In 2 S 3 micro-nano materials and TEA molecules were analyzed from the molecular internal structure, and it was found that the selective response characteristics of the material to TEA were related to its microstructure, including shape adsorption.
研究领域:
材料科学
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化学传感器技术
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纳米材料研究
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Yunlong Yu,Zhiyan Ma,Xiaoya Miao,Yanyu Cui,Yaping Song,Sen Liu,Teng Fei,Tong Zhang
Low humidity detection has been a great challenge in the field of humidity sensing. In recent years, polyelectrolytes have been proven to be promising materials for highly sensitive humidity sensors . In this work, cross-linked poly(ionic liquid)s (PILs) were prepared for low humidity detection. The strong hydrophilicity of PILs contributes to humidity sensing while the cross-linked structure guarantees the stability of the sensing film. The optimized sensor shows high response (48.0) in 5–35% RH, with short response/recovery time (1 s/10 s) and a small humidity hysteresis (0.2% RH). The possible sensing mechanism of the sensors was discussed.
研究领域:
材料科学
·
传感器技术
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产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2021
·
IF 4.641
Wen Ge,Xiaohui Zhang,Xiutao Ge,Kong Liu
Herein, a novel gas-sensing nanocomposite of α-Fe 2 O 3 / x %SiO 2 ( x = 0, 10, 15, 20, 30) was synthesized for the first time by sol-gel. With an increase in SiO 2 concentration to 30 %, the average crystallite size and pore-size distribution of samples exhibited a decreasing trend. The surface area also showed an increasing trend with the introduction of SiO 2 . Gas-sensing measurement results revealed that the α-Fe 2 O 3 /20 %SiO 2 nanocomposite showed the highest response (R a /R g = 50.20) to 500 ppm acetone at its optimal operating temperature of 290 °C, which was about 34 times higher than that of the pure α-Fe 2 O 3 gas sensor. The response/recovery time of the α-Fe 2 O 3 /20 %SiO 2 -based sensor to 500 ppm acetone was 14 s/7 s. The response/recovery time of α-Fe 2 O 3 was 25 s/21 s. After SiO 2 was modified, the response/recovery speed increased. The results demonstrated the potential of α-Fe 2 O 3 /20 %SiO 2 -based gas sensors for sensitive and selective detection of acetone.
研究领域:
材料科学
·
传感器技术
✓ 已验证
DOI
高影响因子
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
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）