SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Mingyu Pi,Daofu Wu,Jian Wang,Kai Chen,Jiao He,Jie Yang,Dingke Zhang,Shijian Chen,Xiaosheng Tang
Benefiting from the environmental sensitivity, perovskite materials show great potentials in sensor devices. Especially, humidity sensors are regarded as reversing disadvantage to advantage of the metal halide perovskites. However, the low stability and the toxicity of lead are the major impediment to practical applications for humidity sensors. Herein, in this work, we prepared Cs 2 SnCl 6 perovskites by a solution-phase synthesis method and demonstrated the excellent humidity sensing property of lead-free perovskite Cs 2 SnCl 6 -based sensors. The fabricated humidity sensors exhibit an ultrahigh impedance change of 2.2E6 from relative humidity (RH) of 11–95% and a short response time (0.8 s) and recovery time (5.4 s), which possesses great potentials in real-time moisture detection. Furthermore, it also presents a good capability of reversibility and an impressive stability. The underlying humidity sensing mechanism under different humidity conditions is also discussed in detail. Our results provide a simple, economic and environmental-friendly method for preparing superior-performance and real time humidity sensor.
研究领域:
材料科学
·
传感器技术
·
环境监测
·
纳米技术
✓ 已验证
DOI
高影响因子
Advanced Sensor Research
·
2023
·
IF 0
Tianqing Liu,Danyao Qu,Lihao Guo,Gandong Zhou,Guangjian Zhang,Tao Du,Weiwei Wu
Human respiration reflects abundant physiological information and could enable non-invasive monitoring, providing information about various biological parameters such as respiration rate and depth. The rapidly growing field of humidity sensors bring forward the requirement for good performance. In this work, by virtue of good hydrophilicity and conductivity, a MXene/thermoplastic polyurethane (TPU) composite film is prepared by coating MXene nanosheets on chitosan-modified TPU electrospun nanofibers via electrostatic interactions, for fabricating a humidity sensor. Based on the principle that the tunnel resistance changing with water molecules influences the distance of MXene nanosheets, the MXene/TPU humidity sensor exhibits fast response (12 s), wide humidity response range (11–94% RH), low hysteresis (<7% RH), and excellent repeatability. The humidity sensor can be assembled with a face mask for distinguishing different human respiration patterns and accurately monitoring respiratory signals during different physical activities, suggesting its promising applications in the fields of respiratory monitoring.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Yueli Liu,Hongbing Guo,Aohan Mei,Keqiang Chen,Wen Chen
Recently, all-inorganic halide perovskite materials have attracted much attention in the fields of humidity sensor due to their sensitive surface, tunable bandgap, high conductivity and excellent carrier mobility. However, their inherent instability and limited sensitivity restrict further application in electronic devices. Herein, we demonstrate a high-performance impedimetric humidity sensor based on an all-inorganic halide perovskite Cs 4 PbBr 6 nanocrystals (NCs), which are obtained by anti-solvent method without long chain ligands. It is found that V Br ∙ defects act as the active site to enhance the ability of adsorbing water molecules. The humidity sensor of Cs 4 PbBr 6 NCs achieves high response value over 4 orders of magnitude at 11–98 % relative humidity, short response/recovery time (8 s/6 s), favorable repeatability, excellent selectivity and good long-term stability. Moreover, high humidity sensing performance enables the humidity sensor of Cs 4 PbBr 6 NCs to possess great potentials in breath monitor and noncontact switch application.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
IEEE ELECTRON DEVICE LETTERS
·
2013
·Vol. 34
·期 11
·1424-1426
·
IF 2.789
Yupeng Zhang,Ying Zhang,Bo Fu,Wei Li,Wenbin Guo,Shengping Ruan,Dali Liu,Yu Chen
Sodium titanate Na
2
Ti
6
O
13
nanorods were synthesized by a hydrothermal method and characterized by X-ray diffraction and scanning electron microscopy. Then, the material was coated on a Al
2
O
3
ceramic substrate to fabricate humidity sensors using Ag-Pd as interdigitated electrodes. The sensor shows high humidity sensitivity and fast response and recovery. The impedance changes by five orders of magnitude over a relative humidity (RH) range from 11% to 95%. At the frequency of 100 Hz, response and recovery times are both <;2 s, and the maximum hysteresis is <;3% RH. In addition, the complex impedance at different RH was investigated to understand the sensing mechanism. The results indicate potential applications of sodium titanate for fabricating high-performance humidity sensors.
研究领域:
材料科学
·
传感器技术
✓ 已验证
DOI
高影响因子
Flexible and Printed Electronics
·
2021
·Vol. 6
·期 4
·045007
·
IF 3.588
Feng-Jie Yan,Wan-Qing Huang,Xu-Hui Sang,Jun-Ge Liang,Xi Wan,Feng Shao,Xiao-Feng Gu
To practice the development of printed electronics, researchers need to have the access to dedicated printer of electronic materials. However, commercial printing machines require large capital investment. Direct ink write (DIW) printing on the other hand operates with single printing head and less complex system therefore is promising for tight budget projects. Herein, a DIW printing system was home-built by making modifications to a 3D printer with ready to use components. Direct pattering and minimal printing line width of 230 ± 10 µm are demonstrated using an all solution-based Ag ink. Resistive-type humidity sensors were fabricated with DIW printed Ag electrodes and poly (diallyl dimethyl ammonium chloride) (PDDA) sensing layer. Humidity sensing performance of the sensors were examined and by taking advantage the flexibility of printing deposition, DIW printing was used to make quick modification toward a partially covered sensor structure for improved performance. Sensing response of more than 99% was obtained from 10% RH to 90% RH. Smaller hysteresis of ±4.4% RH and faster response of 7 s for adsorption and 213 s for desorption were obtained with the partially covered sensor. DIW printing is found to be a useful tool for device prototyping and ink development of printed electronics.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
Materials
·
2017
·Vol. 10
·期 5
·535
·
IF 2.654
Min Yin,Fang Yang,Zhaojie Wang,Miao Zhu,Ming Liu,Xiuru Xu,Zhenyu Li
One-dimensional SnO2- and Li+-doped SnO2porous nanofibers were easily fabricated via electrospinning and a subsequent calcination procedure for ultrafast humidity sensing. Different Li dopant concentrations were introduced to investigate the dopant’s role in sensing performance. The response properties were studied under different relative humidity levels by both statistic and dynamic tests. The best response was obtained with respect to the optimal doping of Li+into SnO2porous nanofibers with a maximum 15 times higher response than that of pristine SnO2porous nanofibers, at a relative humidity level of 85%. Most importantly, the ultrafast response and recovery time within 1 s was also obtained with the 1.0 wt % doping of Li+into SnO2porous nanofibers at 5 V and at room temperature, benefiting from the co-contributions of Li-doping and the one-dimensional porous structure. This work provides an effective method of developing ultrafast sensors for practical applications—especially fast breathing sensors.Keywords:humidity sensor;electrospun porous nanofibers;lithium doping;response-recovery behavior
研究领域:
材料科学
·
传感器技术
✓ 已验证
DOI
高影响因子
ACS Applied Electronic Materials
·
2021
·
IF 3.314
Shijie Hou,Yukuan Shen,Yan Wang,Xuan Zhang,Wei Luo,Jia Huang
Ecofriendly and biofriendly materials are highly appealing in electronic devices with the booming development of the Internet of Things. Humidity sensors perform an indispensable role in various fields such as monitoring industry processes and living systems. In this contribution, for the first time, edible and abundant material-flour has been introduced to the sensing layers for humidity detection. The ionic conductive K2CO3 and hygroscopic glycerol (Gly) with biosafety were introduced to the sensing layer to promote a humidity sensing capability and long-time stability. The ingestible Gly-K2CO3 flour-based humidity sensor using PLA as substrates displays an excellent sensing performance and wide humidity detecting range. Good linearity between capacitance and relative humidity (RH) has been achieved for the RH range from 6% to 94%. According to a wireless monitoring system, even at 250 kHz, the sensor can still monitor the nuance of the humidity difference between 40% and 43% and exhibited an ultrafast response time (0.3 s) and recovery time (0.7 s). Furthermore, the consistent and stable sensing performance after long-time measurements for 100 days and bending tests for 500 cycles also demonstrated a long-time humidity detecting stability and mechanical flexibility for the Gly-K2CO3 flour-based humidity sensor. Humidity sensing mechanisms were thoroughly investigated through SEM-EDX, FTIR, XPS, and complex impedance spectroscopies. The enhanced sensing performance, wide humidity detecting range, and long-time stability are attributed to the ionic conductivity from K2CO3 and the hydrogen-bond interaction between H2O and enormous hydrophilic groups, such as hydroxyl and amino groups in the flour-based networks and binary solvent.
研究领域:
材料科学
·
电子工程
·
环境科学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 18
·9963-9969
·
IF 2.936
Zhe Wang,Min Xue,Herong Zhang,Zihui Meng,Kenneth J. Shea,Lili Qiu,Tiantian Ji,Tengsheng Xie
Traditional artificial opals are assembled from silica or polystylene colloidals which have poor swellability and a lower response to stimuli. A novel three-dimensional photonic crystal array sensor which has a high stability and desired structural colour was fabricated from the self assembly of nano hydrogel colloids. The nano hydrogel colloids were prepared by co-polymerisation of N-isopropylacrylamide, functional monomer acrylic acid and N-tert-butylacrylamide. The relative humidity from 20% to 100% could be detected rapidly via the reflection spectrum of the nano hydrogel colloidal array with a maximum amount of red shift of 24 nm. The response kinetics for humidity of the nano hydrogel colloidal array were investigated, and correspondingly, a rational response mechanism of the compactness of the close-packed structure caused by the swelling of the nano hydrogel colloidal array was discussed. The nano hydrogel colloidal array sensor presented good reversibility and can be reused for at least five rounds.
研究领域:
材料科学
·
传感器技术
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2013
·Vol. 15
·期 10
·1-6
·
IF 2.175
Zhang Ying,Chen Yu,Zhang Yupeng,Cong Huahua,Fu Bo,Wen Shanpeng,Ruan Shengping
A novel porous nanosized humidity-sensing material of amine-functionalized titanium metal organic framework (MOF), NH 2 -MIL-125(Ti), was investigated. NH 2 -MIL-125(Ti) nanoparticles with high phase purity and good physicochemical property were synthesized by a simple hydrothermal method. The nanosized MOF was characterized by X-ray diffraction and scanning electron microscope. The average size of the MOF nanoparticles is around 300 nm. Then NH 2 -MIL-125(Ti) humidity sensor was fabricated by coating the nanosized materials on interdigitated electrodes. The humidity sensor based on NH 2 -MIL-125(Ti) shows good linearity of RH (11–95 % RH), as well as fast response and recovery time. The RH detecting range is from 11 to 95 % RH at 100 Hz. The response and recovery time are about 45 and 50 s, respectively. Moreover, the sensing mechanism was discussed by complex impedance analysis in detail. These results indicate the potential application of NH 2 -MIL-125(Ti) in humidity sensors.
研究领域:
生物医学工程
·
材料科学
·
传感器技术
·
纳米技术
✓ 已验证
DOI
高影响因子
DYES AND PIGMENTS
·
2023
·
IF 4.5
Taisheng Wang,Yifan Wu,Yangguang Xia,Ye Yuan,Ziyi Dou,Chenqun Kan,Na Zhang
We have synthesized a kind of cyano-substituted oligo( p -phenylene) hybrid materials by Knoevenagel condensation reaction, which can be used as ratiometric relative humidity (RH) sensor. When the RH increased from 5 % to 90 %, the maximum emission peak of C1-3/SG gradually redshifted from 530 nm to 575 nm with the fluorescence changed from green to orange. This phenomenon can be attributed to the water vapor induced aggregation of dyes on the matrix. The non-covalent force between the dyes and the silica gel could be adjusted by altering the structures of the dyes, and the RH sensing property of the final hybrid materials could be further regulated. R2-3/SG hybrid fabricated by R2 with large steric isooctyl groups possessed indiscernible RH sensing properties, while the R1-3/SG without hydrogen bond interactions between dyes and substrate was more susceptible to water vapor. The surface properties and specific surface area of the substrate were critical for RH sensing. RH sensing properties were not presented for the substrates without hydroxyl groups or low specific surface area such as PET or PP fibers. Moreover, we have prepared a kind of C1 loaded paper strips, which exhibited potentially ability in anticounterfeiting application.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2019
·
IF 6.044
Jun Rao,Hui Gao,Ying Guan,Wen-qi Li,Qiang Liu
An effective and green method to incorporate graphene oxide into quaternized hemicelluloses to form a hemicelluloses based film was introduced in this study. Tight, homogeneous, and smooth surfaces of the film were obtained from the SEM image. Data on the mechanical properties of the films indicated that the hybrid films prepared from QH and GO (component of GO was 4.8%) exhibited a high tensile strength of 43.83 MPa. This finding suggested that addition of GO contributed to the desirable mechanical properties of the hybrid film. The hybrid films exhibited high sensitivity to humidity; they could be bent spontaneously under wet conditions within seconds and stretched under dry conditions. In addition, the results of DMA indicated that the storage modulus of the hybrid films had an order of magnitude change in value at different humidities. These characteristics show that films can be potentially used in bio-medicine, packaging materials, and humidity sensors.
研究领域:
材料科学
·
生物医学工程
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 13
·8145-8153
·
IF 4.036
Yulei Gao,Xiang Di,Fenfen Wang,Pingchuan Sun
Amorphous polymer-based room temperature phosphorescence (RTP) materials exhibiting tunable emission colors have received tremendous attention and are extremely challenging to prepare. Herein, polyacrylamide-based RTP materials with tunable multicolor emission were prepared via copolymerizing phosphor with concentration dependent luminescence colors and acrylamide with different molar ratios. The hydrogen bonding interactions and chemically crosslinked structures in these polymers effectively restrict the mobility of phosphors and activate efficient RTP emission. The molar ratio of phosphor and acrylamide has a significant influence on the photophysical properties of these polymers, which can be used to fabricate multicolor materials. In addition, the RTP intensity decreases with increasing humidity due to the disassociation of hydrogen bonding by adsorption of water, manifesting as a humidity sensor. Benefiting from the distinguishable RTP lifetimes and the responsiveness to humidity, triple encoding for information encryption is successfully realized.
研究领域:
高分子化学
·
分析化学
·
材料科学
·
传感器技术
·
信息安全
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）