Recognizing Physisorption and Chemisorption in Carbon Nanotubes Gas Sensors by Double Exponential Fitting of the Response

被引：27

作者：

Calvi, Andrea ^{[1
]}

Ferrari, Alberto ^{[1
]}

Sbuelz, Luca ^{[1
]}

Goldoni, Andrea ^{[2
]}

Modesti, Silvio ^{[1
,3
]}

机构：

[1] Univ Trieste, Dept Phys, Via A Valerio 2, I-34127 Trieste, Italy

[2] Elettra Sincrotrone Trieste, SS 14,Km 163-5, I-34149 Trieste, Italy

[3] CNR IOM TASC, SS 14,Km 163-5, I-34149 Trieste, Italy

来源：

SENSORS | 2016年 / 16卷 / 05期

关键词：

CNTs sensors; chemisorption; physisorption; SENSING PROPERTIES; COMPOSITES; NH3;

D O I：

10.3390/s16050731

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Multi-walled carbon nanotubes (CNTs) have been grown in situ on a SiO2 substrate and used as gas sensors. For this purpose, the voltage response of the CNTs as a function of time has been used to detect H-2 and CO2 at various concentrations by supplying a constant current to the system. The analysis of both adsorptions and desorptions curves has revealed two different exponential behaviours for each curve. The study of the characteristic times, obtained from the fitting of the data, has allowed us to identify separately chemisorption and physisorption processes on the CNTs.

引用

页数：9

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