Pt-modified carbon nanotube networked layers for enhanced gas microsensors

被引：33

作者：

Penza, M. ^{[1
]}

Rossi, R. ^{[1
]}

Alvisi, M. ^{[1
]}

Suriano, D. ^{[1
]}

Serra, E. ^{[1
]}

机构：

[1] ENEA, Brindisi Tech Unit Technol Mat, I-72100 Brindisi, Italy

来源：

THIN SOLID FILMS | 2011年 / 520卷 / 03期

关键词：

Carbon nanotubes networks; Platinum-decoration; Gas sensors; CHEMICAL SENSORS; LOW-TEMPERATURE; FILMS; SENSITIVITY; ELECTRONICS;

D O I：

10.1016/j.tsf.2011.04.178

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Carbon nanotubes (CNTs) networked films have been grown by chemical vapor deposition (CVD) technology onto miniaturized low-cost alumina substrates, coated by nanosized Co-catalyst for growing CNTs, to perform chemical detection of toxic gasses (NO(2) and NH(3)), greenhouse gasses (CO(2) and CH(4)) and domestic safety gasses (CO and C(2)H(5)OH) at an operating sensor temperature of 120 degrees C. The morphology and structure of the CNTs networks have been characterized by scanning electron microscopy (SEM). A dense network of bundles of multiple tubes consisting of multi-walled carbon nanostructures appears with a maximum length of 1-5 mu m and single-tube diameter varying in the range of 5-40 nm. Surface modifications of the CNTs networks with sputtered Platinum (Pt) nanoclusters, at tuned loading of 8, 15 and 30 nm, provide higher sensitivity for significantly enhanced gas detection compared to un-decorated CNTs. This could be caused by a spillover of the targeted gas molecules onto Pt-catalyst surface with a chemical gating into CNTs layers. The measured electrical conductance of the functionalized CNTs upon exposures of a given oxidizing and reducing gas is modulated by a charge transfer model with p-type semiconducting characteristics. The effect of activated carbons as chemical filters to reduce the influence of the domestic interfering alcohols on CO gas detection has been studied. Functionalized CNT gas sensors exhibited better performances compared to unmodified CNTs, making them highly promising candidates for functional applications of gas control and alarms. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：959 / 965

页数：7

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