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Room temperature H2 S gas sensor based on rather aligned ZnO nanorods with flower-like structures
,
Article
Sensors and Actuators, B: Chemical
;
Volume 207,Issue PartA
,
February
,
2015
,
Pages 865-871
;
09254005 (ISSN)
; Zad, A. I
; Mortezaali, A
;
Sharif University of Technology
Elsevier
2015
Abstract
Rather vertically aligned ZnO rods with flower-like structures were grown on quartz substrates through vapor phase transport method. X-ray diffraction (XRD) analysis and photoluminescence (PL) measurement were performed to determine crystalline structure and defects, respectively. H2 S gas sensing properties of the grown structure were investigated at both room temperature and 250 °C for comparison. A remarkable increase in response and selectivity at room temperature compared to 250 °C was observed. High response and selectivity to low concentrations of H2 S at room temperature as well as good stability make the sensor a promising candidate for practical applications
Design and fabrication of sensitive carbon nanotubes/PMMA film for acetone vapour detection
, Article International Journal of Nanomanufacturing ; Volume 5, Issue 3-4 , 2010 , Pages 268-277 ; 17469392 (ISSN) ; Iraji Zad, A ; Hormozi Nezhad, M. R ; Sharif University of Technology
2010
Abstract
We present gas sensing property of carbon nanotubes (CNTs) polymethylmethacrylate (PMMA) composite as the active element for acetone vapour detection at room temperature. The polymeric films were formed by spin coating method on SiO2 substrates. Then they were activated by dropping the CNTs suspension in acetone on the PMMA films. The CNT/PMMA films were characterised by SEM, TEM and Raman spectroscopy. Variation of film's electrical resistance after exposure polar and non-polar gases is utilised as the principle of gas sensing. The experimental results showed that the samples present chemical selectivity and reversibility toward polar gases especially acetone vapour