Highly chemoresistive humidity sensing using poly(ionic liquid)s

2016 ◽  
Vol 52 (54) ◽  
pp. 8417-8419 ◽  
Author(s):  
Lingling Wang ◽  
Xiaochuan Duan ◽  
Wuyuan Xie ◽  
Qiuhong Li ◽  
Taihong Wang
Keyword(s):  
Ionic Liquid ◽  
Relative Humidity ◽  
High Performance ◽  
Humidity Sensor ◽  
High Sensitivity ◽  
Fast Response ◽  
Humidity Sensors ◽  
Humidity Sensing ◽  
Good Repeatability ◽  
Poly Ionic Liquid

A novel resistance type humidity sensor was fabricated using poly(ionic liquid)s, which exhibited high sensitivity, fast response, small hysteresis and good repeatability at a relative humidity (RH) in the range of 11–98%, making poly(ionic liquid)s as promising sensing materials for high-performance humidity sensors.

High-performance humidity sensors from Ni(SO4)0.3(OH)1.4 nanobelts

Nanoscale ◽  
2014 ◽  
Vol 6 (12) ◽  
pp. 6521-6525 ◽  
Author(s):  
Ming Zhuo ◽  
Yuejiao Chen ◽  
Tao Fu ◽  
Haonan Zhang ◽  
Zhi Xu ◽  
...  
Keyword(s):  
High Performance ◽  
Humidity Sensor ◽  
High Sensitivity ◽  
Fast Response ◽  
Humidity Sensors ◽  
Term Stability ◽  
Long Term Stability

Ni(SO4)0.3(OH)1.4 nanobelts are utilized in a humidity sensor by a facile method. The nanobelt based sensor shows a high sensitivity, fast response and long-term stability in the sensing process.

scholarly journals The Effect of rGO-Doping on the Performance of SnO2/rGO Flexible Humidity Sensor

Nanomaterials ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 3368
Author(s):  
Huangping Yan ◽  
Zilu Chen ◽  
Linyuan Zeng ◽  
Zijun Wang ◽  
Gaofeng Zheng ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
High Performance ◽  
Humidity Sensor ◽  
High Sensitivity ◽  
Polyimide Film ◽  
Fast Response ◽  
Humidity Sensing ◽  
Transmission Electron ◽  
Bending Radius ◽  
New Applications

The development of a flexible and high-performance humidity sensor is essential to expand its new applications, such as personal health monitoring and early diagnosis. In this work, SnO2/rGO nanocomposites were prepared by one-step hydrothermal method. The effect of rGO-doping on humidity sensing performance was investigated. Scanning electron microscopy, transmission electron microscopy, X-ray diffraction and Raman spectroscopy were used to characterize the nanostructure, morphology and chemical composition of SnO2/rGO nanocomposites. The SnO2/rGO humidity sensitive film was prepared by electrospinning on a polyimide film modified with gold electrodes. The humidity test results show that different doping ratios of rGO have different effects on humidity sensing properties. Among them, the sensor with 2 wt% rGO-doping has a high sensitivity (37,491.2%) within the humidity range as well as the fast response time (80 s) and recover time (4 s). Furthermore, the sensor with 2 wt% rGO-doping remains good flexibility and stability in the case of bending (1000 times). The sensitivity of the 2 wt% rGO-doping sensor at the bending radius (8 mm and 4 mm) is 48,219% and 91,898%, respectively. More importantly, the sensor could reflect different breathing states clearly and track breathing intervals as short as 3 s. The SnO2/rGO flexible humidity sensor with accuracy, flexibility and instantaneity as well as the facile fabrication strategy is conceivable to be applied in the potential application for human health real-time monitoring.

scholarly journals Porous Nanostructured Gadolinium Aluminate for High-Sensitivity Humidity Sensors

Materials ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 7102
Author(s):  
Corneliu Doroftei ◽  
Liviu Leontie
Keyword(s):  
Relative Humidity ◽  
Significant Influence ◽  
Humidity Sensor ◽  
Sol Gel ◽  
High Sensitivity ◽  
Combustion Method ◽  
Humidity Sensors ◽  
Oxide Compound ◽  
P Type ◽  
Highly Porous

This paper presents the synthesis of gadolinium aluminate (GdAlO3), an oxide compound with a perovskite structure, for applications as a capacitive and/or resistive humidity sensor. Gadolinium aluminate was synthesized by the sol-gel self-combustion method. This method allowed us to obtain a highly porous structure in which open pores prevail, a structure favorable to humidity sensors. Most of the materials studied as capacitive/resistive humidity sensors have significant sensitivities only with respect to one of these types of sensors. In the case of the studied gadolinium aluminate with p-type electric conductivity, the relative humidity of the air has a significant influence on both capacitive and resistive types of electric humidity sensors. The capacity increases about 10,000 times, and the resistance decreases about 8000 times as the relative humidity increases from 0 to 98%. The investigated gadolinium aluminate can be used successfully to obtain high-sensitivity capacitive and/or resistive humidity sensors.

scholarly journals Development of La3+Doped CeO2Thick Film Humidity Sensors

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Chunjie Wang ◽  
Aihua Zhang ◽  
Hamid Reza Karimi
Keyword(s):  
Relative Humidity ◽  
High Performance ◽  
Humidity Sensor ◽  
Humidity Sensors ◽  
Response Recovery ◽  
Relative Humidity Range ◽  
Response And Recovery ◽  
Sensitive Characteristics ◽  
Humidity Range ◽  
Maximum Humidity

The humidity sensitive characteristics of the sensor fabricated from 10 mol% La2O3doped CeO2nanopowders with particle size 17.26 nm synthesized via hydrothermal method were investigated at different frequencies. It was found that the sensor shows high humidity sensitivity, rapid response-recovery characteristics, and narrow hysteresis loop at 100 Hz in the relative humidity range from 11% to 95%. The impedance of the sensor decreases by about five orders of magnitude as relative humidity increases. The maximum humidity hysteresis is about 6% RH, and the response and recovery time is 12 and 13 s, respectively. These results indicate that the nanosized La2O3doped CeO2powder has potential application as high-performance humidity sensor.

High-performance humidity sensors based on electrospinning ZnFe2O4 nanotubes

RSC Advances ◽  
2015 ◽  
Vol 5 (84) ◽  
pp. 68299-68304 ◽  
Author(s):  
Ming Zhuo ◽  
Ting Yang ◽  
Tao Fu ◽  
Qiuhong Li
Keyword(s):  
High Performance ◽  
Humidity Sensor ◽  
Hollow Structure ◽  
Electrical Measurements ◽  
Excellent Performance ◽  
Humidity Sensors ◽  
Humidity Sensing ◽  
Electrospinning Method

In this paper, ZnFe2O4 nanotubes with hollow structure were synthesized by a simple electrospinning method. Humidity sensor was fabricated based on these nanotubes. The electrical measurements show excellent performance in humidity sensing.

scholarly journals Humidity Sensors with Shielding Electrode Under Interdigitated Electrode

Sensors ◽  
2019 ◽  
Vol 19 (3) ◽  
pp. 659 ◽  
Author(s):  
Hong Liu ◽  
Qi Wang ◽  
Wenjie Sheng ◽  
Xubo Wang ◽  
Kaidi Zhang ◽  
...  
Keyword(s):  
Humidity Sensor ◽  
High Sensitivity ◽  
Fast Response ◽  
Capacitive Sensors ◽  
Humidity Sensors ◽  
Interdigitated Electrode ◽  
Response Recovery ◽  
Chip Fabrication ◽  
Good Agreement ◽  
Capacitive Humidity Sensor

Recently, humidity sensors have been investigated extensively due to their broad applications in chip fabrication, health care, agriculture, amongst others. We propose a capacitive humidity sensor with a shielding electrode under the interdigitated electrode (SIDE) based on polyimide (PI). Thanks to the shielding electrode, this humidity sensor combines the high sensitivity of parallel plate capacitive sensors and the fast response of interdigitated electrode capacitive sensors. We use COMSOL Multiphysics to design and optimize the SIDE structure. The experimental data show very good agreement with the simulation. The sensitivity of the SIDE sensor is 0.0063% ± 0.0002% RH. Its response/recovery time is 20 s/22 s. The maximum capacitance drift under different relative humidity is 1.28% RH.

scholarly journals High-Sensitivity Whispering Gallery Mode Humidity Sensor Based on Glycerol Microdroplet Volumetric Expansion

Sensors ◽  
2021 ◽  
Vol 21 (5) ◽  
pp. 1746
Author(s):  
Pauls Kristaps Reinis ◽  
Lase Milgrave ◽  
Kristians Draguns ◽  
Inga Brice ◽  
Janis Alnis ◽  
...  
Keyword(s):  
Relative Humidity ◽  
Free Space ◽  
Humidity Sensor ◽  
Low Cost ◽  
High Sensitivity ◽  
Whispering Gallery Mode ◽  
Whispering Gallery ◽  
Volumetric Expansion ◽  
Highly Sensitive ◽  
Good Repeatability

We demonstrate a highly sensitive whispering gallery mode (WGM) relative humidity (RH) sensor based on a glycerol microdroplet. WGMs were excited using a 760 nm tunable semiconductor laser. We used free space coupling, which is effective when using a liquid resonator. A detailed analysis of different parameters influencing the sensor’s characteristics (sensitivity, hysteresis, resolution, stability, and temperature) is presented. The sensitivity of the sensor is one of the highest reported (2.85 nm/% RH in the range 50–70% RH with the resolution 1 × 10−4% RH). This type of humidity sensor has several advantages, such as high sensitivity, extended lifetime, good repeatability, and low cost, as well as the use of a non-toxic and environmentally friendly liquid.

scholarly journals Fully printed high performance humidity sensors based on two-dimensional materials

Nanoscale ◽  
2018 ◽  
Vol 10 (12) ◽  
pp. 5599-5606 ◽  
Author(s):  
P. He ◽  
J. R. Brent ◽  
H. Ding ◽  
J. Yang ◽  
D. J. Lewis ◽  
...  
Keyword(s):  
High Performance ◽  
Humidity Sensor ◽  
High Sensitivity ◽  
Black Phosphorus ◽  
Two Dimensional ◽  
Humidity Sensors ◽  
Two Dimensional Materials ◽  
Very High

We present the results from an all inkjet printed 2D-black phosphorus humidity sensor displaying very high sensitivity.

scholarly journals An Easily Fabricated High Performance Fabry-Perot Optical Fiber Humidity Sensor Filled with Graphene Quantum Dots

Sensors ◽  
2021 ◽  
Vol 21 (3) ◽  
pp. 806
Author(s):  
Ning Wang ◽  
Wenhao Tian ◽  
Haosheng Zhang ◽  
Xiaodan Yu ◽  
Xiaolei Yin ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Relative Humidity ◽  
Optical Fiber ◽  
Optical Fibers ◽  
High Performance ◽  
Humidity Sensor ◽  
Graphene Quantum Dots ◽  
High Sensitivity ◽  
Single Mode ◽  
Fabry Perot

An easily fabricated Fabry-Perot optical fiber humidity sensor with high performance was presented by filling Graphene Quantum Dots (GQDs) into the Fabry-Perot resonator, which consists of two common single mode optical fibers. The relative humidity sensing performance was experimentally investigated by an interference spectrum drift between 11 %RH to 85 %RH. 0.567 nm/%RH sensitivity and 0.99917 linear correlation were found in experiments that showed high sensitivity, good and wide-range linear responding. Meanwhile, its good responding repeatability was demonstrated by two circle tests with increasing and decreasing relative humidity. For investigating the measurement influence caused by a temperature jitter, the temperature responding was experimentally investigated, which showed its linear responding with 0.033 nm/°C sensitivity. The results demonstrate the humidity sensitivity is greatly higher than the temperature sensitivity. The wavelength shift influence is 0.0198 nm with 0.6 °C max temperature jitter in the experiment, which can be ignored in humidity experiments. The fast-dynamic responses at typical humidity were demonstrated in experiments, with 5.5 s responding time and 8.5 s recovering time. The sensors with different cavity lengths were also investigated for their humidity response. All sensors gave good linear responding and high sensitivity. In addition, the relation curve between cavity length and response sensitivity also had good linearity. The combination of GQDs and single mode optical fibers showed easy fabrication and good performance for an optical fiber relative humidity sensor.

scholarly journals Ultrafast Humidity Sensing by Anisotropic Deformation of Carbon Nitride Nanoribbons for Real-Time Respiratory Monitoring

2020 ◽  
Author(s):  
Yuye Zhang ◽  
Yongxiu Song ◽  
Hong Yang ◽  
Kaiyang Chen ◽  
Qing Zhou ◽  
...  
Keyword(s):  
Real Time ◽  
Carbon Nitride ◽  
Humidity Sensor ◽  
High Sensitivity ◽  
Fast Response ◽  
Respiratory Monitoring ◽  
Humidity Sensing ◽  
User Friendly ◽  
Adsorption Desorption ◽  
Anisotropic Deformation

Developing humidity sensing materials with fast response and high sensitivity was of great interest for many applications from industrial field to human healthcare. Here, we report a carbon nitride nanoribbons (CNNRs)-based humidity sensor. Thanks to the delicate humidity-responsive anisotropic deformation and well-balanced hydrophilic surfaces/hydrophobic framework with rapid adsorption/desorption of water molecules by CNNRs, this humidity sensor possessed an ultrafast response of ca. 50 ms, high reproducibility and selectivity, and linearity in an almost full humidity range. As an example, this sensor was successfully applied to real-time breathing detection, and the as-obtained breathing graphic waveforms exhibited a higher sensitivity than that by the traditional clinic measurements. This work would pave a new way for ultrafast and sensitive humidity sensing by using anisotropic deformation of CNNRs and introduce a new application scheme of humidity sensors in more user-friendly respiratory monitoring with higher resolution.<br>

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