Improving humidity selectivity in formaldehyde gas sensing by a two-sensor array made of Ga-doped ZnO

Han, Ning; Tian, Yajun; Wu, Xiaofeng; Chen, Yunfa

doi:10.1016/j.snb.2009.01.054

Cited by 135 publications

(60 citation statements)

References 32 publications

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“…Such highly conductive metal oxides have been widely used in optoelectronic applications [32][33][34][35]. In the field of gas sensors, the application of conductive ZnO NRs is limited to chemical sensors [36][37][38][39], while currently there is no reported application in the field of GISs.…”

Section: Introductionmentioning

confidence: 99%

An enhanced gas ionization sensor from Y-doped vertically aligned conductive ZnO nanorods

Lee

Fang

Turner

et al. 2016

Sensors and Actuators B: Chemical

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A stable and highly sensitive gas ionization sensor (GIS) constructed from vertically aligned, conductive yttrium-doped ZnO nanorod (YZO NR) arrays is demonstrated. The conductive YZO NRs are synthesized using a facile one-pot hydrothermal method. At higher Y/Zn molar ratio, the aspect ratio of the YZO NRs is increased from 11 to 25. Doping with yttrium atoms decreases the electrical resistivity of ZnO NRs more than 100 fold. GIS measurements reveal a 6-fold enhancement in the sensitivity accompanied with a significant reduction in breakdown voltage from the highly conductive YZO NRs. Direct correlations between the resistivity of the NRs and GIS characteristics are established. 1 An Enhanced Gas Ionization Sensor from Y-doped Vertically Aligned Conductive ZnO Nanorods AbstractA stable and highly sensitive gas ionization sensor (GIS) constructed from vertically aligned, conductive yttrium-doped ZnO nanorod (YZO NR) arrays is demonstrated. The conductive YZO NRs are synthesized using a facile one-pot hydrothermal method. At higher Y/Zn molar ratio, the aspect ratio of the YZO NRs is increased from 11 to 25. Doping with yttrium atoms decreases the electrical resistivity of ZnO NRs more than 100 fold. GIS measurements reveal a 6-fold enhancement in the sensitivity accompanied with a significant reduction in breakdown voltage from the highly conductive YZO NRs. Direct correlations between the resistivity of the NRs and GIS characteristics are established.

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Section: Introductionmentioning

confidence: 99%

An enhanced gas ionization sensor from Y-doped vertically aligned conductive ZnO nanorods

Lee

Fang

Turner

et al. 2016

Sensors and Actuators B: Chemical

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“…The combination of oxides in some have shown higher sensing property compared to individual compounds [11]. Selectivity of Zinc oxide sensor is also improved by doping it with Gallium [17].…”

Section: Various Sensors For Aldehyde Detectionmentioning

confidence: 99%

Organic Molecule Based Sensor for Aldehyde Detection

Mallya

Ramamurthy

2015

Smart Sensors, Measurement and Instrumentation

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Abstract. Aldehydes are used in food and beverage industries, production of resins, soap and perfume industries. When used in excess quantity or found in products in undesired quantity this is a threat to humans. Hence it becomes very important to detect these VOCs even at lower concentration. The other sources of aldehyde are polluted air and water. Exposure to aldehyde can cause gene mutation and cancer. Conductometric sensors with metal oxide semiconductors as sensing films, cataluminesence based sensors, quartz crystal microbalance sensors, analytical methods such as HPLC have been used for the detection of aldehydes. These are sophisticated techniques require skilled staff to perform the tests. Chemiresistor is a simple method of fabrication of conductometric sensor. In this method the sensing layer is a film cast between two electrodes deposited on an insulating substrate. The response of the sensor to various analytes is monitored by recording the changes taking place in the sensing element. Organic molecule based sensors are low cost and operate at room temperature. Selectivity of the sensors to a particular analyte is an issue in sensors. An analyte molecule can interact with the various binding sites on a molecule. A molecule has to be designed and synthesized to be selective to a particular analyte of interest. This can be achieved by selecting a molecule which has a functional group that interacts with the analyte molecule. The mechanism of interaction of the analyte with the sensing molecule can be understood by doing molecular simulations. Molecular modelling allows monitoring the interaction of the analyte and sensing molecule. Here an example of organic molecule based sensor for selective interaction with aldehydes is illustrated.The organic molecule ophenylenediamine blended with carbon black as sensing element of the chemiresistor to decrease the resistance. Molecular modelling can be used to understand the interaction between aldehyde and o-phenylenediamine molecule.

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“…The gas sensing property of obtained nonowires (shown in Figure 6) was tested using formaldehyde gas as working gas in a home-made instrument as we reported earlier (Han et al, 2009), which demonstrates the high gas sensing property of plasma synthesized ZnO nanowires comparing to the literature (Bie et al, 2007;Patil et al, 2007). From the patterns (Han et al, 2010) www.intechopen.com we can see that ZnO with length about 500 nm performed the highest gas response at both 300 o C and 400 o C, followed by ZnO nanowires with length about 200 nm and 2 μm, respectively.…”

Section: Nanowire Based Gas Sensormentioning

confidence: 99%