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Silver clusters on tin oxide thin fi...

Zhang, Jianping.

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Silver clusters on tin oxide thin film surfaces and their application to gas sensors.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Silver clusters on tin oxide thin film surfaces and their application to gas sensors./
Author:	Zhang, Jianping.
Description:	144 p.
Notes:	Adviser: Konrad Colbow.
Contained By:	Dissertation Abstracts International57-03B.
Subject:	Chemistry, Analytical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=NN06883
ISBN:	9780612068834

Silver clusters on tin oxide thin film surfaces and their application to gas sensors.
Zhang, Jianping.

Silver clusters on tin oxide thin film surfaces and their application to gas sensors. - 144 p.

Adviser: Konrad Colbow.

Thesis (Ph.D.)--Simon Fraser University (Canada), 1995.

We observed for the first time fractal patterns of silver growth on tin oxide (SnO$\sb2)$ films under appropriate operating conditions. The pattern growth processes and structures were studied by SEM, AES, and XRD. It was found that the size of patterns varied from ten to hundreds of micrometers with a branch diameter of about 2 micrometers. The patterns were formed by Ag and AgCl with a thin layer of silver oxide on the surface.

ISBN: 9780612068834Subjects--Topical Terms:

586156
Chemistry, Analytical.

Silver clusters on tin oxide thin film surfaces and their application to gas sensors.
LDR:03462nam 2200325 a 45 001 947868
005 20110524
008 110524s1995 ||||||||||||||||| ||eng d
020 $a 9780612068834
035 $a (UMI)AAINN06883
035 $a AAINN06883
040 $a UMI $c UMI
100 1 $a Zhang, Jianping. $3 1271336
245 1 0 $a Silver clusters on tin oxide thin film surfaces and their application to gas sensors.
300 $a 144 p.
500 $a Adviser: Konrad Colbow.
500 $a Source: Dissertation Abstracts International, Volume: 57-03, Section: B, page: 1828.
502 $a Thesis (Ph.D.)--Simon Fraser University (Canada), 1995.
520 $a We observed for the first time fractal patterns of silver growth on tin oxide (SnO$\sb2)$ films under appropriate operating conditions. The pattern growth processes and structures were studied by SEM, AES, and XRD. It was found that the size of patterns varied from ten to hundreds of micrometers with a branch diameter of about 2 micrometers. The patterns were formed by Ag and AgCl with a thin layer of silver oxide on the surface.
520 $a The patterns obtained from our experimental method have both fractal and dense packed structures. The fractal dimension of the clusters was determined to be 1.69 $\pm$ 0.03, in excellent agreement with the theoretical value of 1.70 $\pm$ 0.02 predicted from the diffusion limited aggregation model (DLA). We also confirmed that the active zone of the cluster can be described by a Gaussian probability distribution function that is characterized by two parameters r$\rm\sb{N}$ and $\rm\sigma\sb{N}$ with two exponents, which were found to be $\upsilon$ = 0.607 $\pm$ 0.013 and $\upsilon\sp\prime$ = 0.512 $\pm$ 0.026 for our clusters, in good agreement with theoretical values calculated from Monte Carlo simulation.
520 $a It was suggested that the pattern growth process in our experiment is basically an aggregation process which can be described theoretically by the DLA model where random walk trajectories are assumed. The pattern appearance and disappearance are believed to be associated with the decomposition of silver oxide and the oxidation of silver at around the decomposition temperature of 300$\rm\sp\circ C.$
520 $a Another interesting subject (part II) in the thesis was to investigate the silver clusters acting as catalytic activators in SnO$\sb2$ gas sensors. Surface silver additives on SnO$\sb2$ thin film gas sensors effectively improved the sensor performance to H$\sb2.$ The sensitivity was increased by at least a factor of 10 and the sensor recovery time decreased after the surface silver addition onto the SnO$\sb2$ surface. The sensitivity was found to be dependent on the operating temperature of the sensors and the amount of Ag additives that influences the cluster details. The experimental results showed that the best performance of sensors could be achieved by evaporating a Ag layer of 40 to 60 A, and operating at temperatures around 300$\rm\sp\circ C.$ The effect of silver additives onto SnO$\sb2$ thin film gas sensors was studied and models for the promotional role of these additives are presented in the final chapter of the thesis.
590 $a School code: 0791.
650 4 $a Chemistry, Analytical. $3 586156
650 4 $a Chemistry, Physical. $3 560527
650 4 $a Engineering, Chemical. $3 1018531
690 $a 0486
690 $a 0494
690 $a 0542
710 2 $a Simon Fraser University (Canada). $3 1020621
773 0 $t Dissertation Abstracts International $g 57-03B.
790 $a 0791
790 1 0 $a Colbow, Konrad, $e advisor
791 $a Ph.D.
792 $a 1995
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=NN06883