scholarly journals Growth and Gas Sensing Properties of Self-Assembled Chain-Like ZnO Nanostructures

2012 ◽  
Vol 47 ◽  
pp. 762-765 ◽  
Author(s):  
V. Galstyan ◽  
E. Comini ◽  
C. Baratto ◽  
A. Ponzoni ◽  
G. Faglia ◽  
...  
Keyword(s):  
Gas Sensing ◽  
Zno Nanostructures ◽  
Sensing Properties ◽  
Gas Sensing Properties ◽  
Self Assembled

scholarly journals Hydrophilicity and carbon chain length effects on the gas sensing properties of chemoresistive, self-assembled monolayer carbon nanotube sensors

2019 ◽  
Vol 10 ◽  
pp. 565-577 ◽  
Author(s):  
Juan Casanova-Cháfer ◽  
Carla Bittencourt ◽  
Eduard Llobet
Keyword(s):  
Carbon Nanotubes ◽  
Nitrogen Dioxide ◽  
Photoelectron Spectroscopy ◽  
Gas Sensing ◽  
Carbon Chain ◽  
Head Group ◽  
Carbon Chain Length ◽  
Sensing Properties ◽  
Gas Sensing Properties ◽  
Self Assembled

Here we describe the development of chemoresistive sensors employing oxygen-plasma-treated, Au-decorated multiwall carbon nanotubes (MWCNTs) functionalized with self-assembled monolayers (SAMs) of thiols. For the first time, the effects of the length of the carbon chain and its hydrophilicity on the gas sensing properties of SAMs formed on carbon nanotubes are studied, and additionally, the gas sensing mechanisms are discussed. Four thiols differing in the length of the carbon chain and in the hydrophobic or hydrophilic nature of the head functional group are studied. Transmission electron microscopy, Raman spectroscopy and X-ray photoelectron spectroscopy are used to analyze the resulting gas-sensitive hybrid films. Among the different nanomaterials tested, short-chain thiols having a hydrophilic head group, self-assembled onto Au-decorated carbon nanotubes were most responsive to nitrogen dioxide and ethanol vapors, even in the presence of ambient humidity. In particular, this nanomaterial was about eight times more sensitive to nitrogen dioxide than bare Au-decorated carbon nanotubes when operated at room temperature. This response enhancement is attributed to the interaction, via strong hydrogen bonding, of the polar molecules tested to the polar surface of hydrophilic thiols. The approach discussed here could be extended further by combining hydrophilic and hydrophobic thiol SAMs in Au-MWCNT sensor arrays as a helpful strategy for tuning sensor response and selectivity. This would make the detection of polar and nonpolar gas species employing low-power gas sensors easier, even under fluctuating ambient moisture conditions.

Facile synthesis and gas sensing properties of tubular hierarchical ZnO self-assembled by porous nanosheets

2015 ◽  
Vol 215 ◽  
pp. 231-240 ◽  
Author(s):  
Faying Fan ◽  
Pinggui Tang ◽  
Yuanyuan Wang ◽  
Yongjun Feng ◽  
Aifan Chen ◽  
...  
Keyword(s):  
Gas Sensing ◽  
Facile Synthesis ◽  
Sensing Properties ◽  
Porous Nanosheets ◽  
Gas Sensing Properties ◽  
Self Assembled

scholarly journals Evaluation of gas-sensing properties of ZnO nanostructures electrochemically doped with Au nanophases

2016 ◽  
Vol 7 ◽  
pp. 22-31 ◽  
Author(s):  
Elena Dilonardo ◽  
Michele Penza ◽  
Marco Alvisi ◽  
Cinzia Di Franco ◽  
Francesco Palmisano ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Gas Sensing ◽  
Low Cost ◽  
Sol Gel ◽  
Zno Nanostructures ◽  
Sensing Properties ◽  
Gas Sensing Properties ◽  
Zno Powders ◽  
One Step ◽  
Chemiresistive Gas Sensors

A one-step electrochemical method based on sacrificial anode electrolysis (SAE) was used to deposit stabilized gold nanoparticles (Au NPs) directly on the surface of nanostructured ZnO powders, previously synthesized through a sol–gel process. The effect of thermal annealing temperatures (300 and 550 °C) on chemical, morphological, and structural properties of pristine and Au-doped ZnO nancomposites (Au@ZnO) was investigated. Transmission and scanning electron microscopy (TEM and SEM), as well as X-ray photoelectron spectroscopy (XPS), revealed the successful deposition of nanoscale gold on the surface of spherical and rod-like ZnO nanostructures, obtained after annealing at 300 and 550 °C, respectively. The pristine ZnO and Au@ZnO nanocomposites are proposed as active layer in chemiresistive gas sensors for low-cost processing. Gas-sensing measurements towards NO2 were collected at 300 °C, evaluating not only the Au-doping effect, but also the influence of the different ZnO nanostructures on the gas-sensing properties.

scholarly journals From 1D and 2D ZnO nanostructures to 3D hierarchical structures with enhanced gas sensing properties

Nanoscale ◽  
2014 ◽  
Vol 6 (1) ◽  
pp. 235-247 ◽  
Author(s):  
Mohammad R. Alenezi ◽  
Simon J. Henley ◽  
Neil G. Emerson ◽  
S. Ravi P. Silva
Keyword(s):  
Gas Sensing ◽  
Hierarchical Structures ◽  
Zno Nanostructures ◽  
Sensing Properties ◽  
Gas Sensing Properties
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