Metalloporphyrins-functionalized carbon nanotube networked films for room-temperature VOCs sensing applications

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• 作者：Michele Penza ; Riccardo Rossi ; Marco Alvisi ; Daniele Valerini ; Emanuele Serra ; Roberto Paolesse ; Eugenio Martinelli ; Arnaldo D’ ; Amico ; Corrado Di Natale
• 关键词：Carbon nanotubes networks gas sensors ; Metalloporphyrins ; CNTs functionalizations ; VOCs detection
• 刊名：Procedia Chemistry
• 出版年：2009
• 出版时间：August 2009
• 年：2009
• 卷：1
• 期：1
• 页码：975-978
• 全文大小：391 K

文摘

Networked films of carbon nanotubes (CNTs) have been grown by Chemical Vapor Deposition (CVD) technology onto cost-effective alumina substrate, coated by Cobalt nanocatalyst for growing the CNTs. The sidewalls of the CNTs films have been functionalized by spray-coating with two different metalloporphyrins (MPP), consisting of a Tetraphenylporphyrin coordinated by a central metal of zinc (Zn-TPP) and manganese (Mn-TPP). The surface-modification of the CNTs with layers of Zn-TPP and Mn-TPP provides enhanced sensitivity and broad selectivity to volatile organic compounds (VOCs). The chemical interactions of these MPP-modified CNTs films with different tested VOCs (alcohols, esters, aromatics, ketones) have been investigated using the miniaturized two-pole chemiresistors technique. The sensor response in terms of p-type electrical conductance in the MPP-modified CNTs-chemiresistors exhibits a good sensing performance, at room temperature. The findings show a VOC adsorption occuring by sensing characteristics of response-concentration relationships as a combined Langmuir-Henry behaviour