Enhanced Acetone Sensing Characteristics of ZnO/Graphene Composites

Zhang, Hao; Cen, Yuan; Du, Yu; Ruan, Shuangchen

doi:10.3390/s16111876

Cited by 52 publications

(28 citation statements)

References 36 publications

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“…Ra and Rg are sensor resistances ( R S ) in air and methane gas respectively. Thus, the response of MP-4 to methane is defined as Response = R a/R g [ 25 , 26 , 27 ] for the traditional circuit without FET, while the response is defined as Response = Ra/Rg × MF for the amplification circuit with FET. The magnification factor ( MF ) of FET is defined as MF = ( R L + R FET , g )/( R L + R FET , a ) [ 20 ], where R FET, a and R FET, g represent FET resistance in the air and methane gas respectively.…”

Section: Methodsmentioning

confidence: 99%

Coupling p+n Field-Effect Transistor Circuits for Low Concentration Methane Gas Detection

Zhou

Yang

Bian

et al. 2018

Sensors

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Nowadays, the detection of low concentration combustible methane gas has attracted great concern. In this paper, a coupling p+n field effect transistor (FET) amplification circuit is designed to detect methane gas. By optimizing the load resistance (RL), the response to methane of the commercial MP-4 sensor can be magnified ~15 times using this coupling circuit. At the same time, it decreases the limit of detection (LOD) from several hundred ppm to ~10 ppm methane, with the apparent response of 7.0 ± 0.2 and voltage signal of 1.1 ± 0.1 V. This is promising for the detection of trace concentrations of methane gas to avoid an accidental explosion because its lower explosion limit (LEL) is ~5%. The mechanism of this coupling circuit is that the n-type FET firstly generates an output voltage (VOUT) amplification process caused by the gate voltage-induced resistance change of the FET. Then, the p-type FET continues to amplify the signal based on the previous VOUT amplification process.

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Section: Methodsmentioning

confidence: 99%

Coupling p+n Field-Effect Transistor Circuits for Low Concentration Methane Gas Detection

Zhou

Yang

Bian

et al. 2018

Sensors

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“…In the sensor's architecture, sensing material plays a very crucial role in responding to the gas molecules. As a sensing material, several pristine and composite materials such as zinc oxide (ZnO) [5], tin oxide (SnO2) [6], titanium dioxide (TiO2) [7], polyaniline (PANI) [8], carbon nanotubes (CNTs) [9], graphene [10] and ZnO-CuO [11] have been widely investigated. Among these sensing materials, graphene has attracted the research community due to its unique properties at room temperature for instance, large surface area (2630 m 2 g −1 ) for molecular adsorption, outstanding thermal (~5000 W.m -1 .k -1 ) and electrical conductivity (up to 6000 S.cm -1 ) and high carrier mobility of 1.5 × 10 5 cm 2 /Vs [12].…”

Section: Introductionmentioning

confidence: 99%

Graphene derivative coated QCM-based gas sensor for volatile organic compound (VOC) detection at room temperature

Gupta

Athirah

Hawari

2020

IJEECS

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<span>Volatile organic compounds (VOCs) affect our daily life through their emission from very common sources such as plants, building materials, paints, pesticides, and fossil fuel burning. The detection of VOCs at room temperature is a prime requirement. The graphene-based gas sensor has the potential to detect these VOC gases due to its attractive features such as high mobility and large surface area. In this work, a graphene-derivative is prepared as a sensing material in order to detect acetone. The thin film of graphene-derivative is prepared by a drop-cast method on a quartz crystal microbalance (QCM) sensor followed by drying in the room environment conditions. The prepared graphene-derivative and thin films are characterized structurally and morphologically by standard microscopic techniques such as FESEM, EDX, and Raman spectroscopy. The electrical parameters such as mobility and resistivity are measured using Hall-effect measurements at room temperature. The response and recovery time of the graphene-derivative based 10 MHz QCM sensor are found to be 23 s and 20 s, respectively. This highly sensitive graphene-based gas sensor with good reversibility can be employed for human health and environment safety applications. </span>

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“…Elsevier, 2019. (d) TEM image of ZnO/graphene nanocomposite [57]. (e) Sketch of the prepared sensor device [57].…”

Section: Chemoresistors Based On Pristine Graphene-metal Oxidesmentioning

confidence: 99%

“…(d) TEM image of ZnO/graphene nanocomposite [57]. (e) Sketch of the prepared sensor device [57]. (f) Sensing response of the ZnO/graphene sensor to 100 ppm of different gases at 280 • C [57].…”

Section: Chemoresistors Based On Pristine Graphene-metal Oxidesmentioning

confidence: 99%

Breakthroughs in the Design of Novel Carbon-Based Metal Oxides Nanocomposites for VOCs Gas Sensing

Pargoletti

Cappelletti

2020

Nanomaterials

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Nowadays, the detection of volatile organic compounds (VOCs) at trace levels (down to ppb) is feasible by exploiting ultra-sensitive and highly selective chemoresistors, especially in the field of medical diagnosis. By coupling metal oxide semiconductors (MOS e.g., SnO2, ZnO, WO3, CuO, TiO2 and Fe2O3) with innovative carbon-based materials (graphene, graphene oxide, reduced graphene oxide, single-wall and multi-wall carbon nanotubes), outstanding performances in terms of sensitivity, selectivity, limits of detection, response and recovery times towards specific gaseous targets (such as ethanol, acetone, formaldehyde and aromatic compounds) can be easily achieved. Notably, carbonaceous species, highly interconnected to MOS nanoparticles, enhance the sensor responses by (i) increasing the surface area and the pore content, (ii) favoring the electron migration, the transfer efficiency (spillover effect) and gas diffusion rate, (iii) promoting the active sites concomitantly limiting the nanopowders agglomeration; and (iv) forming nano-heterojunctions. Herein, the aim of the present review is to highlight the above-mentioned hybrid features in order to engineer novel flexible, miniaturized and low working temperature sensors, able to detect specific VOC biomarkers of a human’s disease.

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Enhanced Acetone Sensing Characteristics of ZnO/Graphene Composites

Cited by 52 publications

References 36 publications

Coupling p+n Field-Effect Transistor Circuits for Low Concentration Methane Gas Detection

Coupling p+n Field-Effect Transistor Circuits for Low Concentration Methane Gas Detection

Graphene derivative coated QCM-based gas sensor for volatile organic compound (VOC) detection at room temperature

Breakthroughs in the Design of Novel Carbon-Based Metal Oxides Nanocomposites for VOCs Gas Sensing

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