High-performance QCM humidity sensor based on graphene oxide/tin oxide/polyaniline ternary nanocomposite prepared by in-situ oxidative polymerization method

Zhang, Dongzhi; Wang, Dongyue; Zong, Xiaoqi; Dong, Guokang; Zhang, Yong

doi:10.1016/j.snb.2018.02.012

Cited by 122 publications

(59 citation statements)

References 43 publications

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“…The special orientation and open structure expose the whole surface to the gas atmosphere, which can enhance surface active sites and improve the absorption ability to target gas molecules. As can be seen in Figure 3c,f, GO showed gossamery nanosheet structure with slight and disordered wrinkles, which makes it produce a large specific surface area [24]. Figure 3b,e displayed the SEM images of 1% GO@SnO 2 NF/NSs.…”

Section: Characterization Of Sensing Materialsmentioning

confidence: 93%

“…Figure 3g showed the TEM image of GO@SnO 2 NF/NSs nanocomposites, which demonstrated that GO nanosheets had successfully been loaded on the surface of hierarchical SnO 2 with a diameter of about 700 nm. As can be seen in Figure 3g disordered wrinkles, which makes it produce a large specific surface area [24]. Figure 3b,e displayed the SEM images of 1% GO@SnO2 NF/NSs.…”

Section: Characterization Of Sensing Materialsmentioning

confidence: 95%

“…The diffraction peak centered at 2θ = 10.6 • in the XRD spectra was signed as (002) of GO [21]. However, the diffraction peak of (002) was not obvious in the XRD spectra of GO@SnO 2 NF/NSs nanocomposites, which due to the low loading ratio the weak peak intensity of GO [22][23][24]. In addition, the absence of XRD characteristic peaks of GO further indicated their good dispersity in nanocomposites.…”

Section: Characterization Of Sensing Materialsmentioning

confidence: 99%

See 2 more Smart Citations

Graphene Oxide@3D Hierarchical SnO2 Nanofiber/Nanosheets Nanocomposites for Highly Sensitive and Low-Temperature Formaldehyde Detection

2019

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In this work, we reported a formaldehyde (HCHO) gas sensor with highly sensitive and selective gas-sensing performance at low operating temperature based on graphene oxide (GO)@SnO 2 nanofiber/nanosheets (NF/NSs) nanocomposites. Hierarchical SnO 2 NF/NSs coated with GO nanosheets showed enhanced sensing performance for HCHO gas, especially at low operating temperature. A series of characterization methods, including X-ray diffraction (XRD), Field emission scanning electron microscopy (FE-SEM), Transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS) and Brunauer-Emmett-Teller (BET) were used to characterize their microstructures, morphologies, compositions, surface areas and so on. The sensing performance of GO@SnO 2 NF/NSs nanocomposites was optimized by adjusting the loading amount of GO ranging from 0.25% to 1.25%. The results showed the optimum loading amount of 1% GO in GO@SnO 2 NF/NSs nanocomposites not only exhibited the highest sensitivity value (R a /R g = 280 to 100 ppm HCHO gas) but also lowered the optimum operation temperature from 120 • C to 60 • C. The response value was about 4.5 times higher than that of pure hierarchical SnO 2 NF/NSs (R a /R g = 64 to 100 ppm). GO@SnO 2 NF/NSs nanocomposites showed lower detection limit down to 0.25 ppm HCHO and excellent selectivity against interfering gases (ethanol (C 2 H 5 OH), acetone (CH 3 COCH 3 ), methanol (CH 3 OH), ammonia (NH 3 ), methylbenzene (C 7 H 8 ), benzene (C 6 H 6 ) and water (H 2 O)). The enhanced sensing performance for HCHO was mainly ascribed to the high specific surface area, suitable electron transfer channels and the synergistic effect of the SnO 2 NF/NSs and GO nanosheets network.Molecules 2020, 25, 35 2 of 15 sensitivity, poor selectivity and/or relatively high optimum operation temperature. Hence, designing and developing gas sensors with high sensibility, excellent selectivity and lower optimum operation temperature is urgent and important.Graphene is a typical two-dimensional (2D) sheet of sp 2 bonded carbon with excellent electronic applications. Due to its unique physical and chemical properties, many efforts have been carried out on the application of graphene as sensing elements [12]. These advantages, including its high conductivity, large surface area and low electrical noise, make it a promising platform for preparing new sensors [13][14][15]. In order to prepare a new gas sensor with high sensing performance, low operation temperature and excellent selectivity, the combination of graphene and metal oxide semiconductors is a new strategy to enhance sensing performance compared to pure sensing materials [16]. Gaikwad et al. have reported a NH 3 gas sensor based on Polyaniline/Graphene Oxide (PANI/GO) by nanoemulsion method [17]. Sun et al. have synthesized rGO/ZnSnO 3 composites as a sensing material for detecting HCHO gas by a facile solution-based self-assembly synthesis method [18]. Rong et al. have prepared microstructures of SnO 2 @rGO nanocomposites for HCHO detection by facile thermal treatment ...

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Section: Characterization Of Sensing Materialsmentioning

confidence: 93%

Section: Characterization Of Sensing Materialsmentioning

confidence: 95%

Section: Characterization Of Sensing Materialsmentioning

confidence: 99%

See 1 more Smart Citation

Graphene Oxide@3D Hierarchical SnO2 Nanofiber/Nanosheets Nanocomposites for Highly Sensitive and Low-Temperature Formaldehyde Detection

2019

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“…The graphene samples were added to the ZrO 2 solution and held at 30 ℃ for 3 d until a powder had formed. The samples were then calcined in air at 600 ℃ for 2 h. Various ratios of the sensing material (5,10,20,30,40, and 50 wt%) were tested.…”

Section: Fabrication Of G/zro 2 Nanocompositesmentioning

confidence: 99%

“…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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Humidity Sensors Based on 3D Porous Polyelectrolytes via Breath Figure Method

Dai

Zhao

Lin

et al. 2019

Adv Elect Materials

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great potential in water adsorption, which is beneficial for humidity sensing. However, the polymer-based BF films with poor conductivity lead to low sensitivity, blocking the development of BF films in the field of humidity sensing. [24] Polyelectrolytes are a class of polymers with polar electrolyte groups in the backbones or side chains, which contribute to the hydrophilicity and conductive capability. They are a good choice for humidity sensing materials because of their low cost, solution processability, flexible functionalization, etc., but linear polyelectrolytes are water soluble usually, so they cannot suffer from high humidity atmospheres for a long time. [25] Cross-linked network polyelectrolytes with excellent structural stability can effectively enhance the reliability of humidity sensors. [26,27] In this work, BF method based porous polymer was used for preparing cross-linked polyelectrolyte and applied for humidity sensing. Poly(4-vinylpyridine) (P4VP) was selected to prepare BF film, which was treated with gaseous 1,4-dichlorobutane (DCB) to obtain stable polyelectrolyte sensitive film. The obtained cross-linked polyelectrolyte P4VP-DCB retains both the 3D porous structure and the hydrophilicity. The effect of porous structure on the adsorption of water molecules was explored via quartz crystal microbalance (QCM). The sensing mechanism was also investigated by Cole-Cole plots and equivalent circuits.

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High-performance QCM humidity sensor based on graphene oxide/tin oxide/polyaniline ternary nanocomposite prepared by in-situ oxidative polymerization method

Cited by 122 publications

References 43 publications

Graphene Oxide@3D Hierarchical SnO2 Nanofiber/Nanosheets Nanocomposites for Highly Sensitive and Low-Temperature Formaldehyde Detection

Graphene Oxide@3D Hierarchical SnO2 Nanofiber/Nanosheets Nanocomposites for Highly Sensitive and Low-Temperature Formaldehyde Detection

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

Humidity Sensors Based on 3D Porous Polyelectrolytes via Breath Figure Method

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