Enhanced gas sensing properties of chemiresistors based on ZnO nanorods electrodecorated with Au and Pd nanoparticles

MRS Advances ◽  
2017 ◽  
Vol 2 (18) ◽  
pp. 1001-1007 ◽  
Author(s):  
E. Dilonardo ◽  
M. Alvisi ◽  
G. Cassano ◽  
M. Penza
Keyword(s):  
Chemical Nature ◽  
Gas Sensing ◽  
Operating Temperature ◽  
Zno Nanorods ◽  
Pd Nanoparticles ◽  
Zno Nanostructures ◽  
Sensing Properties ◽  
Deposited Metal ◽  
Gas Sensing Properties ◽  
Pollutant Gases

ABSTRACTColloidal Au and Pd nanoparticles (NPs) were directly electrochemically synthesized, by sacrificial anode electrolysis (SAE), on hydrothermal ZnO nanostructures, previously desiccated; further, the functionalized ZnO nanostructures were subjected to thermal annealing at 550°C to obtain stable ZnO nanorods (NRs), superficially decorated by naked metal NPs. The both pristine and metal functionalized ZnO NRs were proposed as active layer in chemiresistive sensors for environmental monitoring to detect pollutant gases (e.g. NO2, C4H10).The effect of the presence and of the chemical nature of the deposited metal NPs on the performance of ZnO NRs-based gas sensor (e.g. sensitivity, selectivity and recovery) was evaluated, comparing the sensing results with those of pristine ZnO NRs. In particular, the gas sensing properties of pristine and metal-functionalized ZnO NRs were studied at an operating temperature of 300°C towards a various range of concentration of different gaseous pollutants.

scholarly journals Gas sensing properties of MWCNT layers electrochemically decorated with Au and Pd nanoparticles

2017 ◽  
Vol 8 ◽  
pp. 592-603 ◽  
Author(s):  
Elena Dilonardo ◽  
Michele Penza ◽  
Marco Alvisi ◽  
Riccardo Rossi ◽  
Gennaro Cassano ◽  
...  
Keyword(s):  
Gas Sensing ◽  
Pd Nanoparticles ◽  
Gaseous Pollutants ◽  
Gas Sensitivity ◽  
Multiwalled Carbon ◽  
Sensing Properties ◽  
Pristine Mwcnts ◽  
Wide Range ◽  
Deposited Metal ◽  
Gas Sensing Properties

Multiwalled carbon nanotube (MWCNT)-based chemiresistors were electrochemically decorated with Au and Pd nanoparticles (NPs), resulting in an improvement in the detection of gaseous pollutants as compared to sensors based on pristine MWCNTs. Electrophoresis was used to decorate MWCNTs with preformed Au or Pd NPs, thus preserving their nanometer-sized dimensions and allowing the metal content to be tuned by simply varying the deposition time. The sensing response of unmodified and metal-decorated MWCNTs was evaluated towards different gaseous pollutants (e.g., NO2, H2S, NH3 and C4H10) at a wide range of concentrations in the operating temperature range of 45–200 °C. The gas sensing results were related to the presence, type and loading of metal NPs used in the MWCNT functionalization. Compared to pristine MWCNTs, metal-decorated MWCNTs revealed a higher gas sensitivity, a faster response, a better stability, reversibility and repeatability, and a low detection limit, where all of these sensing properties were controlled by the type and loading of the deposited metal catalytic NPs. Specifically, in the NO2 gas sensing experiments, MWCNTs decorated with the lowest Au content revealed the highest sensitivity at 150 °C, while MWCNTs with the highest Pd loading showed the highest sensitivity when operated at 100 °C. Finally, considering the reported gas sensing results, sensing mechanisms have been proposed, correlating the chemical composition and gas sensing responses.

Au sensitized ZnO nanorods for enhanced liquefied petroleum gas sensing properties

2016 ◽  
Vol 371 ◽  
pp. 224-230 ◽  
Author(s):  
U.T. Nakate ◽  
R.N. Bulakhe ◽  
C.D. Lokhande ◽  
S.N. Kale
Keyword(s):  
Gas Sensing ◽  
Zno Nanorods ◽  
Liquefied Petroleum Gas ◽  
Sensing Properties ◽  
Gas Sensing Properties

TUNGSTEN-DOPED TiO2 NANOLAYERS WITH IMPROVED CO2 GAS SENSING PROPERTIES FOR ENVIRONMENTAL APPLICATIONS

2017 ◽  
Vol 24 (Supp02) ◽  
pp. 1850024 ◽  
Author(s):  
MALIHEH SABERI ◽  
ALI AKBAR ASHKARRAN
Keyword(s):  
Electron Microscopy ◽  
Gas Sensing ◽  
Operating Temperature ◽  
Sol Gel ◽  
Optimum Operating ◽  
Optimum Operating Temperature ◽  
Sensing Properties ◽  
Vis Spectroscopy ◽  
Gas Sensing Properties ◽  
Tungsten Concentration

Tungsten-doped TiO2 gas sensors were successfully synthesized using sol–gel process and spin coating technique. The fabricated sensor was characterized by field emission scanning electron microscopy (FE-SEM), ultraviolet visible (UV–Vis) spectroscopy, transmission electron microscopy (TEM), X-Ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy. Gas sensing properties of pristine and tungsten-doped TiO2 nanolayers (NLs) were probed by detection of CO2 gas. A series of experiments were conducted in order to find the optimum operating temperature of the prepared sensors and also the optimum value of tungsten concentration in TiO2 matrix. It was found that introducing tungsten into the TiO2 matrix enhanced the gas sensing performance. The maximum response was found to be (1.37) for 0.001[Formula: see text]g tungsten-doped TiO2 NLs at 200[Formula: see text]C as an optimum operating temperature.

In situ growth of WO3 nanotube arrays and their H2S gas sensing properties for reduced operating temperature

2020 ◽  
Vol 271 ◽  
pp. 127716
Author(s):  
Xiaoguang San ◽  
Yiming Lu ◽  
Guosheng Wang ◽  
Dan Meng ◽  
Xiaohui Gong ◽  
...  
Keyword(s):  
Gas Sensing ◽  
Operating Temperature ◽  
Nanotube Arrays ◽  
In Situ Growth ◽  
Sensing Properties ◽  
Gas Sensing Properties
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