Fabrication and characterization of an ultrasensitive humidity sensor based on metal oxide/graphene hybrid nanocomposite

Zhang, Dongzhi; Chang, Hongyan; Li, Peng; Liu, Runhua; Xue, Qingzhong

doi:10.1016/j.snb.2015.11.024

Cited by 380 publications

(134 citation statements)

References 50 publications

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“…The CIS was measured at different RH environment and at the operating frequency of 0.01 Hz to 100 KHz. In order to make the contrast of the CIS of the HAp sensor more obvious, some real and imaginary parts were enlarged in the same scale …”

Section: Humidity Sensing Mechanismmentioning

confidence: 99%

“…In order to make the contrast of the CIS of the HAp sensor more obvious, some real and imaginary parts were enlarged in the same scale. [23] [29] Polypyrrole/ZnO Polymer 240 60 11-95% [30] PPy composite Polymer 41 120 11-95% [31] SiO 2 /SBA-15 Porous 11 61 11-95% [32] TiO 2 /TGOs Ceramic 192 59 11.3-93.4% [33] RGO/ PDDA Ceramic 108-147 94-133 11-97% [34] HAp Ceramic 0.9 5.6 12-97% This work At low relative humidity (12-44%), the CIS of the HAp was a semi-circular. The radius of the semicircle is determined by the intrinsic impedance of HAp sensor.…”

Section: Humidity Sensing Mechanismmentioning

confidence: 99%

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A Rapid Response/Recovery Ribbon‐like Hydroxyapatite Humidity Sensor with Loose Spatial Structure

Sun

et al. 2019

ChemistrySelect

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A rapid response/recovery ribbon‐like hydroxyapatite (HAp) humidity sensor with loose spatial structure has been fabricated in this work. The HAp film was prepared on polyethylene terephthalate‐indium tin oxide (PET‐ITO) interdigital substrate by electrochemical deposition method. The HAp film was characterized by XRD, SEM, FTIR techniques. Electrochemically deposited HAp has a preferred orientation in a‐plane, which exposes a great many of hydroxyl groups. The HAp has a flat ribbon‐like microstructure that effectively captures and detects water molecules. The gap of the interdigital electrode was filled with long ribbon‐like HAp to form a loose spatial structure which facilitates water molecules adsorption and desorption. The HAp humidity sensor showed high sensitivity, low hysteresis and good linearity. In particular, HAp sensor has a short response time of 0.9 s and recovery time of 5.6 s. Besides, the humidity sensing mechanism of HAp sensor was also investigated in detail.

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Section: Humidity Sensing Mechanismmentioning

confidence: 99%

Section: Humidity Sensing Mechanismmentioning

confidence: 99%

A Rapid Response/Recovery Ribbon‐like Hydroxyapatite Humidity Sensor with Loose Spatial Structure

Sun

et al. 2019

ChemistrySelect

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“…8, the sensor response time of the 40 wt% G/ZrO 2 device (humidification from 12 to 90% RH) was only 5 s, and the recovery time (desiccation from 90 to 12% RH) was approximately 20 s. This clearly demonstrates the potential of using 40 wt% G/ZrO 2 in the detection of relative humidity. The humidity sensing properties of the present humidity sensor were compared with those of sensors in the literature (19,(28)(29)(30)(31)(32) in Table 3. It can be found that our sensor exhibits outstanding sensing properties with high sensitivity, rapid response/recovery times, and small hysteresis in the To evaluate the stability of the G/ZrO 2 nanocomposite fabricated sensor at two different temperatures of 25 and 35 ℃, we have exposed the sample in the air for 144 h followed by a measurement of the impedance to various RH levels.…”

Section: Sensing Systemmentioning

confidence: 99%

Humidity Sensors Based on High Performance Graphene/Zirconium Dioxide Nanocomposite Material

2018

Sensors and Materials

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This paper reports a novel graphene (G)/zirconium dioxide (ZrO 2 ) nanocomposite produced using a sol-gel method with various weight percentages of graphene for use in humidity sensors. The morphological and structural properties of the (G/ZrO 2 ) were characterized using X-ray diffraction (XRD) , Fourier transform infrared (FTIR), transmission electron microscopy (TEM), and energy-dispersive X-ray spectroscopy (EDX). The response characteristics of the sensor, including sensitivity, hysteresis, response time, and recovery time, were investigated from theoretical as well as experimental perspectives. Experimental results revealed a linear functional relationship between shifts in the impedance of the sensor and variations in relative humidity. The sensor with 40 wt% G/ZrO 2 nanocomposite demonstrated a sensitivity (S = 4011) exceeding that of the other samples. At all humidity levels, the humidity hysteresis values remained low, and the response and recovery times were very rapid (5 and 20 s, respectively). These results demonstrate the considerable potential of using G/ZrO 2 nanocomposites in the further development of humidity sensors.

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“…The main parameter that dictates the humidity sensor performance is the rate of change in a material property to the change in the surrounding relative humidity. Among various materials for humidity sensors, metal oxides nanoparticles have attracted special interest due to their high surface contact area with water molecules, controllable porosity, nano-sized grains, low cost, and simple construction [8][9][10][11]. Tin (IV) oxide or SnO 2 (an n-type semiconductor) is one of the useful and popular materials for humidity sensing from metal oxide group and offers a potential for developing portable and inexpensive humidity sensing device [12].…”

Section: Introductionmentioning

confidence: 99%

All-Optical Humidity Sensor Using SnO2 Nanoparticle Drop Coated on Straight Channel Optical Waveguide

et al. 2019

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The straight channel optical waveguide coated with the SnO 2 nanoparticle is studied as an all-optical humidity sensor. The proposed sensor shows that the transmission loss of the waveguide increases with increasing relative humidity (RH) from 56% to 90% with very good repeatability. The sensitivity to changes in relative humidity is ~2 dB/% RH. The response time of the humidity sensor is 2.5 s, and the recovery time is 3.5 s. The response to humidity can be divided into 3 different regions, which are correlated to the degree of water adsorption in the SnO 2 nanoparticle layer. Compared with the previous all-optical humidity sensor based on SnO 2 , the proposed sensor exhibits more rapid response, simpler fabrication process, and higher sensitivity. The proposed sensor has a potential application in the long distance, remote agriculture, and biological humidity sensing.

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Fabrication and characterization of an ultrasensitive humidity sensor based on metal oxide/graphene hybrid nanocomposite

Cited by 380 publications

References 50 publications

A Rapid Response/Recovery Ribbon‐like Hydroxyapatite Humidity Sensor with Loose Spatial Structure

A Rapid Response/Recovery Ribbon‐like Hydroxyapatite Humidity Sensor with Loose Spatial Structure

Humidity Sensors Based on High Performance Graphene/Zirconium Dioxide Nanocomposite Material

All-Optical Humidity Sensor Using SnO2 Nanoparticle Drop Coated on Straight Channel Optical Waveguide

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