Effect of annealing temperature on the characteristic of reduced highly ordered TiO2 nanotube arrays and their CO gas-sensing performance

Processing and Application of Ceramics

Budiman Harry¹  Gunlazuardi Jarnuzi²  Wibowo Rahmat²  Zuas Oman³ 

[1] Department of Chemistry, Faculty of Mathematics and Natural Science, Universitas Indonesia, Depok, Indonesia + Gas Analysis Laboratory, Metrology in Chemistry Research Group, Centre for Research and Human Resources Development-National Standardization Agency of Indonesia (BSN), SNSU Building No. 420, PUSPIPTEK, Tangerang Selatan, Indonesia;Department of Chemistry, Faculty of Mathematics and Natural Science, Universitas Indonesia, Depok, Indonesia;Gas Analysis Laboratory, Metrology in Chemistry Research Group, Centre for Research and Human Resources Development-National Standardization Agency of Indonesia (BSN), SNSU Building No. 420, PUSPIPTEK, Tangerang Selatan, Indonesia;

关键词: titania;    anodization;    nanotube;    calcination;    carbon monoxide;    gas sensor;   

DOI  :  10.2298/PAC2104417B

来源: DOAJ

【 摘 要 】

A study on the effect of temperature on the reduced highly ordered TiO2 nanotube arrays (reduced-HOTNAs) and their CO gas-sensing performance is reported. The reduced-HOTNAs were prepared by anodizing method followed by annealing in the presence of urea at various temperatures (i.e. 450, 500, 550, 600 and 700°C) under N2 atmosphere. The reduced-HOTNAs were characterized by FTIR, FE-SEM, XRD, UV-Vis DRS, Raman spectroscopy and photoelectrochemical techniques. The sensing performance of the reduced-HOTNAs was assessed against CO gas in air mixture. The results show that the reduced-HOTNAs annealed at 450 °C (reduced- HOTNAs-450) is a material with the most significant improvement in sensitivity to detect CO compared with other reduced-HOTNAs. The reduced-HOTNAs-450 exhibits best sensing performance at a relatively low CO concentration in the range of 2-25 ppm at 300°C. Findings of this study indicate that improvement of the reduced-HOTNAs-450 sensitivity might be attributed to the presence of Ti3+/oxygen vacancy defect and the formation of more active sites on TiO2 surface, making the reduced-HOTNAs-450 a promising active material for CO gas sensor application.

【 授权许可】

Unknown