NO<SUB>2</SUB> Gas Sensing Performance of Co-Doped NiO Thin Film Sensors

AbstractSemiconducting oxides are widely known and commercially applied for their gas sensing properties. However, biochemical sensing has mostly depended on optical and electrochemical techniques that are more cumbersome. This work investigates the biosensing characteristics of ZnO nanobelts and ZnO thin films. Zinc oxide thin film sensors showed changes in conductivity after protein functionalization with rabbit IgG and hybridization with anti-rabbit IgG. Conductivity changes were also measured after coating the oxides with MCF-7 cancer cells and its antibodies. In another set of experiments, ZnO nanobelts showed systematic conductivity changes with rabbit IgG protein hybridization. The experimental results in this paper indicate that the conductimetric properties of nano and thin film oxides can be sensitized to protein and cancer cell hybridization reactions. This technique can also be applied to certain other pathogen proteins or toxic proteins from the environment leading to low-cost miniaturized wireless biosensors.

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NiO Thin Film Fabricated by Electrophoretic Deposition and Formaldehyde Gas Sensing Property Thereof

Journal of Nanoscience and Nanotechnology ◽

10.1166/jnn.2009.c153 ◽

2009 ◽

Vol 9 (2) ◽

pp. 1346-1349 ◽

Cited By ~ 6

Author(s):

Ning Han ◽

Yajun Tian ◽

Lianqi Wei ◽

Chen Wang ◽

Yunfa Chen

Keyword(s):

Thin Film ◽

Electrophoretic Deposition ◽

Gas Sensing ◽

Nio Thin Film

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Liquid-Phase Co-Exfoliated Graphene/MoS2 Nanocomposite for Methanol Gas Sensing

Journal of Nanoscience and Nanotechnology ◽

10.1166/jnn.2015.11254 ◽

2015 ◽

Vol 15 (10) ◽

pp. 8004-8009 ◽

Cited By ~ 13

Author(s):

Shao-Lin Zhang ◽

Hongyan Yue ◽

Xishuang Liang ◽

Woo-Chul Yang

Keyword(s):

Thin Film ◽

Gas Sensing ◽

Synergetic Effect ◽

Film Sensor ◽

Thin Film Sensor ◽

Sensor Material ◽

Enhanced Sensitivity ◽

Distinct Structure ◽

Nanocomposite Sensor ◽

Sensing Performance

We developed an efficient method to co-exfoliate graphite and MoS2 to fabricate graphene/MoS2 nanocomposite. The size, morphology, and crystal structure of the graphene/MoS2 nanocomposite were carefully examined. The as-prepared graphene/MoS2 nanocomposite was fabricated into thin film sensor by a facile drop casting method and tested with methanol gas in various concentrations. The sensitivity, response time, and repeatability of the graphene/MoS2 nanocomposite sensor towards methanol gas were systematically investigated. A pure MoS2− based thin film sensor was also prepared and compared with the nanocomposite sensor to better understand the synergetic effect in the sensing performance. Our research demonstrated that compositing MoS2 with graphene could overcome the shortcoming of MoS2 as a sensor material and bring in a promising gas-sensing performance with a quicker response/recovery time and an enhanced sensitivity. Moreover, this composited material with a distinct structure and an excellent electronic property is expected to have potential application in various fields, such as optoelectronic.

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