Study on gas sensing of reduced graphene oxide/ZnO thin film at room temperature

A novel hybrid structure sensor based on cobalt carbonate hydroxide hydrate (CCHH) and reduced graphene oxide (RGO) was designed for room temperature NH3 detection. This hybrid structure consisted of CCHH and RGO (synthesized by a one-step hydrothermal method), in which RGO uniformly dispersed in CCHH, being used as the gas sensing film. The resistivity of the hybrid structure was highly sensitive to the changes on NH3 concentration. CCHH in the hybrid structure was the sensing material and RGO was the conductive channel material. The hybrid structure could improve signal-to-noise ratio (SNR) and the sensitivity by obtaining the optimal mass proportion of RGO, since the proportion of RGO was directly related to sensitivity. The gas sensor with 0.4 wt% RGO showed the highest gas sensing response reach to 9% to 1 ppm NH3. Compared to a conventional gas sensor, the proposed sensor not only showed high gas sensing response at room temperature but also was easy to achieve large-scale production due to the good stability and simple synthesis process.

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Ammonia Gas Detection by Tannic Acid Functionalized and Reduced Graphene Oxide at Room Temperature

Journal of Nanomaterials ◽

10.1155/2014/497384 ◽

2014 ◽

Vol 2014 ◽

pp. 1-6 ◽

Cited By ~ 40

Author(s):

Sweejiang Yoo ◽

Xin Li ◽

Yuan Wu ◽

Weihua Liu ◽

Xiaoli Wang ◽

...

Keyword(s):

Graphene Oxide ◽

Reduced Graphene Oxide ◽

Gas Sensor ◽

Tannic Acid ◽

Room Temperature ◽

Gas Sensing ◽

High Sensitivity ◽

Gas Detection ◽

Ammonia Gas ◽

Reduced Graphene

Reduced graphene oxide (rGO) based chemiresistor gas sensor has received much attention in gas sensing for high sensitivity, room temperature operation, and reversible. Here, for the first time, we present a promising chemiresistor for ammonia gas detection based on tannic acid (TA) functionalized and reduced graphene oxide (rGOTA functionalized). Green reductant of TA plays a major role in both reducing process and enhancing the gas sensing properties ofrGOTA functionalized. Our results showrGOTA functionalizedonly selective to ammonia with excellent respond, recovery, respond time, and recovery times.rGOTA functionalizedelectrical resistance decreases upon exposure to NH3where we postulated that it is due to n-doping by TA and charge transfer betweenrGOTA functionalizedand NH3through hydrogen bonding. Furthermore,rGOTA functionalizedhinders the needs for stimulus for both recovery and respond. The combination of greener sensing material and simplicity in overall sensor design provides a new sight for green reductant approach of rGO based chemiresistor gas sensor.

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Fe3O4/rGO nanocomposite: synthesis and enhanced NOxgas-sensing properties at room temperature

RSC Advances ◽

10.1039/c6ra02306a ◽

2016 ◽

Vol 6 (43) ◽

pp. 37085-37092 ◽

Cited By ~ 16

Author(s):

Ying Yang ◽

Li Sun ◽

Xiangting Dong ◽

Hui Yu ◽

Tingting Wang ◽

...

Keyword(s):

Graphene Oxide ◽

Detection Limit ◽

Response Time ◽

Reduced Graphene Oxide ◽

Room Temperature ◽

Gas Sensing ◽

High Sensitivity ◽

Short Response Time ◽

Reduced Graphene ◽

Sensing Performance

Fe3O4nanoparticles-decorated reduced graphene oxide nanocomposites have been successfully synthesized using solvothermal-pyrolytic method. They have superior gas sensing performance with low detection limit, high sensitivity and short response time.

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The influence of oxygen functional groups on gas-sensing properties of reduced graphene oxide (rGO) at room temperature

RSC Advances ◽

10.1039/c6ra05659h ◽

2016 ◽

Vol 6 (57) ◽

pp. 52339-52346 ◽

Cited By ~ 20

Author(s):

X. Wang ◽

X. Li ◽

Y. Zhao ◽

Y. Chen ◽

J. Yu ◽

...

Keyword(s):

Graphene Oxide ◽

Reduced Graphene Oxide ◽

Functional Groups ◽

Room Temperature ◽

Gas Sensing ◽

Sensing Properties ◽

Oxygen Functional Groups ◽

Reduced Graphene ◽

Gas Sensing Properties

Three methods were used to prepare reduced graphene oxide (rGO) with various ratios of oxygen functional groups, such as –OOH, –OH and CO, to study their effects on the NO2 sensing properties at room temperature.

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VOCs Sensing Property of Graphene Oxide Thin Film by Reduction Rate

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.440.64 ◽

2013 ◽

Vol 440 ◽

pp. 64-68 ◽

Cited By ~ 1

Author(s):

Ho Sang Ahn ◽

Hye Jin Park ◽

Ju Hyun Oh ◽

Jin Chul Joo ◽

Dong Joo Kim

Keyword(s):

Thin Film ◽

Graphene Oxide ◽

Thermal Treatment ◽

Reduced Graphene Oxide ◽

Gas Sensing ◽

Reduction Rate ◽

Oxide Thin Film ◽

Film Sensor ◽

Reduced Graphene ◽

Different Temperatures

We demonstrate a combinatorial graphene oxide (GO) and reduced graphene oxide (rGO) thin film sensor fabricated by spin coating and dip casting method. Thermal treatment was followed to convert graphene oxide into reduced graphene oxide at different temperatures. 100ppm of evaporated methanol was utilized to examine the resistance profile of graphene oxide thin film and reduced graphene oxide thin film. Crystalline phase of GO and rGO were characterized by XRD. Surface roughness was observed by FE-SEM. Obvious opposite sensing property of GO and rGO were observed according to drying conditions.It was attributed to the change in number of radicals and type attached to the edge and surface of graphene oxide during reduction. Authors suggest that control of reduction rate by thermal treatment would be the one of the readiest approaches to enhance the selectivity of gas sensing in terms of direction of reaction.

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N-doped reduced graphene oxide for room-temperature NO gas sensors

Scientific Reports ◽

10.1038/s41598-021-99883-9 ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Yu-Sung Chang ◽

Feng-Kuan Chen ◽

Du-Cheng Tsai ◽

Bing-Hau Kuo ◽

Fuh-Sheng Shieu

Keyword(s):

Graphene Oxide ◽

Reduced Graphene Oxide ◽

Room Temperature ◽

Gas Sensing ◽

Ambient Conditions ◽

Gas Sensitivity ◽

Nitrogen Doped ◽

Low Concentrations ◽

Reduced Graphene ◽

P Type

AbstractIn this study, we use nitrogen-doped to improving the gas-sensing properties of reduced graphene oxide. Graphene oxide was prepared according to a modified Hummers’ method and then nitrogen-doped reduced graphene oxide (N-rGO) was synthesized by a hydrothermal method using graphene oxide and NH4OH as precursors. The rGO is flat and smooth with a sheet-like morphology while the N-rGO exhibits folded morphology. This type of folding of the surface morphology can increase the gas sensitivity. The N-rGO and the rGO sensors showed n-type and p-type semiconducting behaviors in ambient conditions, respectively, and were responsive to low concentrations of NO gases (< 1000 ppb) at room temperature. The gas-sensing results showed that the N-rGO sensors could detect NO gas at concentrations as low as 400 ppb. The sensitivity of the N-rGO sensor to 1000 ppb NO (1.7) is much better than that of the rGO sensor (0.012). Compared with pure rGO, N-rGO exhibited a higher sensitivity and excellent reproducibility.

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Improved Cl2 sensing characteristics of reduced graphene oxide when decorated with copper phthalocyanine nanoflowers

RSC Advances ◽

10.1039/c7ra02212c ◽

2017 ◽

Vol 7 (41) ◽

pp. 25229-25236 ◽

Cited By ~ 17

Author(s):

Sanjeev Kumar ◽

Navdeep Kaur ◽

Anshul Kumar Sharma ◽

Aman Mahajan ◽

R. K. Bedi

Keyword(s):

Graphene Oxide ◽

Detection Limit ◽

Reduced Graphene Oxide ◽

Room Temperature ◽

Copper Phthalocyanine ◽

Gas Sensing ◽

Sensing Platform ◽

Reduced Graphene ◽

Sensing Characteristics

A novel gas sensing platform involving a hybrid of reduced graphene oxide (rGO) sheets with unsubstituted copper phthalocyanine (CuPc) nanoflowers has been explored as a room temperature ppb level chemiresistive chlorine (Cl2) sensor with a detection limit as low as 1.97 ppb.

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