Journal of Materials Chemistry A
·
2025
·
IF 9.5
Xiaosai Hu,Haoran Cao,Haoqi Liu,Hongming Lv,Yuanyu Ge,Tianchi Zhou
High-humidity environments are of great significance to ecology, industrial and agricultural production, and human health. However, the simultaneous realization of high sensitivity, low hysteresis, high resolution, and outstanding linear response in a single flexible humidity sensor, especially for measuring high relative humidity (RH) levels, remains a great challenge. In this study, a flexible self-supporting sensing film capable of accurately detecting high moisture levels was fabricated by utilizing vinyl-functionalized polyethyleneimine as the humidity sensing material, eliminating the need for an additional flexible substrate. The as-prepared flexible self-supporting polyethyleneimine sensor demonstrated high sensitivity (1644%/%RH), minimal humidity hysteresis (0.6% RH), and excellent linearity (R2 = 0.9998) within the humidity range of 70% to 97% RH. Notably, the sensor boasted a high resolution of 0.1% RH with a strong linear response (R2 = 0.9846), enabling the real-time monitoring of human respiratory rates, speech patterns, and skin humidity variations. This work provides an innovative approach to constructing a polyethyleneimine humidity sensor for precise humidity measurement in high RH environments.
研究领域:
材料科学
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传感器技术
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环境监测
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柔性电子学
✓ 已验证
产品关联
DOI
高影响因子
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
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传感器技术
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环境监测
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纳米技术
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2018
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IF 5.667
Rui Zhou,Jun Li,Hongwei Jiang,Hui Li,Yao Wang,Danick Briand,Malick Camara,Guofu Zhou,Nico F. de Rooij
A highly transparent humidity sensor has been developed on ITO patterned glass substrate. The fabrication included coating the fluoropolymer insulating layer and cellulose acetate butyrate sensing layer on the ITO interdigitated electrode arrays by screen printing process. The transmittance in the visible band and the capacitive response to the relative humidity ranging from 0% to 90% of the printed sensors were tested experimentally. The fabricated sensors showed a high transparency of 90.74%–92.29% and a linearity of 0.96 of capacitance response to relative humidity in the range of 0%–90%. Fabricated by the low-cost screen printing process which is widely used in display industry, the transparent sensors showed a great application prospect to be integrated on displays in smart devices.
研究领域:
材料科学
·
传感器技术
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Yong Zhang,Jianxu Ren,Yiwei Wu,Xiangli Zhong,Tao Luo,Juexian Cao,Mengqi Yin,Mingpeng Huang,Zhiyong Zhang
Ultra-low humidity detection is significant in some important industrial fields, such as integrated circuit manufacturing, chip packaging. However, the traditional ionic-type humidity sensor is not competent for the detection of ultra-low humidity, but can only realize the detection of medium humidity to high humidity. Here, moisture-induced discoloration material Nickel(II) iodide (NiI 2 ) is found to be highly sensitive to moisture, and both its electrical properties and color will change with environmental humidity variation. Especially, NiI 2 exhibits the largest impedance change to date in the ultra-low humidity range compared with state of the art. The impedance variation is up to 2 orders of magnitude in the range of 0.4 %–11 % RH, which means that NiI 2 can realize the detection of ultra-low humidity. The excellent performance of NiI 2 in ultra-low humidity is attributed to the material transition characteristics susceptible to humidity rather than the traditional surface mechanism of water adsorption. Moreover, combining the reversible black-to-transparency moisture-induced discoloration behavior with humidity sensing properties, a flexible wristband based on NiI 2 is developed to realize the dual-mode detection of wide range environmental humidity. These results demonstrate that NiI 2 has great application prospects in professional ultra-low humidity detection and wearable humidity detection equipment.
研究领域:
材料科学
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传感器技术
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Tianjun Xu,Rongchao Li,Tengfei Zhang,Yuhan Li,Hulin Zhang,Zhongyun Yuan,Kai Zhuo
In this study, gallium oxide hydroxide (GaOOH) nanorods were synthesized using a hydrothermal method, which was followed by a high-temperature nitriding process to synthesize gallium nitride (GaN) nanorods. Then, potassium chloride (KCl)-modified GaN nanorod composite materials were prepared using the physical mixing method. The analysis of the humidity sensitivity test demonstrated that the KCl/GaN nanorods with a KCl loading of 2.5 wt% exhibited the best humidity sensitivity, with a resistance change response of 36589.59 under 97% relative humidity (RH), which was 2.51 times that of pure GaN nanorods without KCl doping. The response and recovery times of the KCl/GaN-2.5- wt% nanorod humidity sensor in a 97%-RH environment were 3 s and 80 s, respectively. The response time did not exhibit considerable fluctuations compared with the undoped GaN nanorods, and the recovery time increased. The hierarchical morphology of the GaN nanorods created abundant adsorption sites for water molecules, while the incorporation of KCl enhanced the electrical conductivity of the composite material, thereby resulting in an increase in the magnitude of the resistance changes of the sensor in environments with different humidity conditions. The sensor also demonstrated excellent repeatability and long-term stability, making it suitable for applications in respiratory monitoring.
研究领域:
材料科学
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电子工程
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生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2015
·
IF 4.097
Yang Li,Kaicheng Fan,Huitao Ban,Mujie Yang
An impedance-type humidity sensor was prepared by sequentially depositing the thin films of crosslinked and quaternized poly(4-vinylpyridine) (QC-P4VP) and reduced graphene oxide (RGO) onto interdigitated gold electrodes. The QC-P4VP/RGO bilayer sensor reveals much lower impedance than QC-P4VP based sensor in the environments with low relative humidity (RH) levels, and could detect ultra-low humidity (0.18%RH) with very high response magnitude (impedance increase of 500% between 2.1%RH and 0.18%RH) at room temperature. Moreover, the bilayer sensor shows small hysteresis (∼4.5%RH) and fast response ( t 90% of 21 s and 78 s for adsorption and desorption processes, respectively). The effect of the concentration of RGO precursor, the deposition order and thickness of the sensing films, temperature, and the structure of the electrodes on the humidity sensing behaviors of the bilayer-structured sensors has been thoroughly examined, and the humidity sensing mechanism was explored.
研究领域:
材料科学
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传感器技术
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
·
2023
·
IF 4.6
Ge Gao,Qiang Li,Hongjie Luo,Xiao Huang
Environmentally friendly humidity-sensitive color-changing materials have important applications in humidity indication. Two humidity-sensitive color-changing materials are prepared by utilizing bromocresol purple (BCP)/bromothymol blue (BTB) as humidity color-changing agents, boric acid as chromogenic agent and porous ceramic as substrate. To verify the repeatability and color-changing behavior of humidity-sensitive color-changing materials, a novel quantitative model of humidity is developed using hyperspectral imaging (HSI) and the K-nearest Neighbor (KNN) model. The two samples based on the KNN model can be achieved to match the measured values of ten humidity levels and show good repeatability after 35 cycles. The reflectance of two samples rapidly changed and stabilized within four minutes at a fixed humidity, which reflects their high humidity sensitivity . The predicted values of BCP sample based on KNN model are closer to the measured values of humidity levels in the range of 85–100% RH, while the predicted values of BTB sample based on KNN model are closer to the measured values of humidity levels in 7%− 23% and 85%− 100% RH range . Visualized assessment of humidity levels at each pixel can be obtained to provide a new approach to real-time monitoring of humidity changes , which shows potential applications in many areas.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
Polymers
·
2022
·Vol. 14
·期 22
·4910
·
IF 4.967
Jianyun Wu,Wenhe Zhou,Xiaowei Wang,Shicheng Li
Polyimide (PI) film is widely used as the key component of the capacitive humidity sensor, whose diffusion coefficient has a significant impact on the sensor’s dynamic characteristics, but is rarely discussed. This paper provides a test method and processes for effective diffusion coefficients of water molecules in self-synthesis PI films. The films were formed by four ingredients (PMDA-ODA, BPDA-ODA and BPDA-BAPP, PMDA-BAPP) with PI acid concentrations of 23%, 20%, 17% and 15%, and tested in temperatures of 20 °C, 35 °C and 50 °C, respectively. The results indicated that BPDA-BAPP film was good as a moisture sensitive film, whose average effective diffusion coefficient was 2.709 × 10−14m2/s. The temperature of the environment had a significant effect on the humidity-sensitive properties, but the PI acid concentration effect could be indirect.Keywords:humidity sensor;polyimide film;humidify-sensitive properties;effective diffusion coefficient
研究领域:
材料科学
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传感器技术
✓ 已验证
产品关联
DOI
PubMed
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
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传感器技术
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Xiaohui Leng,Dan Luo,Zongxiang Xu,Fei Wang
Graphene oxide (GO) and its derivatives have been applied to the humidity sensing area in recent years due to its abundant hydrophilic functional groups, and proved to be ultrasensitive to the humidity changing. But the stability of the sensors is always an obstacle to their application. Besides, the long-term linearity is seldom studied. In this work, diamine modified GO (MGO) has been synthesized and mixed with Nafion polymer to form a hybrid film, and applied to the humidity sensors. We have applied two measurement methods by either fitting of the impedance spectra to extract charge transfer resistance (R ct ) or measurement of the impedance under a certain frequency, to evaluate the response to the relative humidity (RH). Both MGO and its composite show good sensitivity to the RH under the two testing methods The R ct shows good linearity at the full testing RH range even after two months, while the impedance under a certain frequency can’t keep the linear response to the RH after certain period of time. The addition of Nafion decreases the R ct and increases the sensitivity of MGO based sensor. Linearity of the sensor is improved by the combination of MGO and Nafion. Long-term testing results show the linearity of the composite sensors changes over time but always keeps a better linearity than the pure MGO sensor.
研究领域:
材料科学
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传感技术
✓ 已验证
产品关联
DOI
高影响因子
IEEE ELECTRON DEVICE LETTERS
·
2024
·Vol. 45
·期 4
·685-688
·
IF 4.1
Yaping Song,Zhiyan Ma,Yanyu Cui,Xiaoya Miao,Yunlong Yu,Ke Wu,Hongran Zhao,Sen Liu,Teng Fei,Tong Zhang
In this work, the polymeric ionic liquid (PIL)/ polybenzimidazole (PBI) composites (PIL/PBIs) based humidity sensors were prepared. The humidity sensing properties of the sensors were controlled by the ratio of PIL and PBI in the sensing films, and the optimized sensor performs a high response of 988.1 in the low humidity range (2%−35% RH). The introduction of PBI into sensing film can guarantee the stability of the humidity sensors. The as-prepared sensor can be utilized to detect the moisture in lubricating oil.
研究领域:
材料科学
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传感器技术
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2014
·
IF 3.84
Yang Li,Taotao Wu,Mujie Yang
Multi-walled carbon nanotubes (MWNTs) were dispersed in the matrix of quaternized and crosslinked poly(4-vinylpyridine) (QC-P4VP) to prepare a composite via solution blending and heat treatment. The composite was characterized by FT-IR spectroscopy and scanning electron microscopy. Thin film humidity sensors based on the composite were fabricated and their electrical responses to relative humidity (RH) were investigated at room temperature. The composite sensor showed much higher response magnitude than the sensor based on MWNTs (impedance increase of ∼4700% from 7 to 90%RH). Meanwhile, its impedance at low humidity was significantly decreased with respect to that of QC-P4VP based sensor. Furthermore, it could detect very low humidity with good sensitivity (impedance change of 16%/%RH over 1–30%RH), and demonstrate its capability of realizing full-range measurement of humidity. The effect of content of MWNTs, poly(4-vinylpyridine) (P4VP) and the additive, molecular weight of P4VP, temperature and testing frequency on the humidity sensing properties of the composite sensors has been examined. A sensing mechanism was proposed by considering the MWNT conductive network in the polyelectrolyte matrix.
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
危险品化学品经营许可证（带存储）