基于 Co3O4 纳米棒的高灵敏度和快速响应 CO 传感器。

Highly sensitive and fast responding CO sensor based on Co3O4 nanorods.

机构信息

Department of Physics, North Maharashtra University, Jalgaon 425 001, Maharashtra, India.

出版信息

Talanta. 2010 Apr 15;81(1-2):37-43. doi: 10.1016/j.talanta.2009.11.034. Epub 2009 Nov 18.

DOI:10.1016/j.talanta.2009.11.034

PMID:20188884

Abstract

Co(3)O(4) nanorods (diameters approximately 6-8 nm and lengths approximately 20-30 nm) were synthesized for the first time through a simple co-precipitation/digestion method by calcination of cobalt hydroxyl carbonate in air and their CO gas sensing properties were investigated. The Co(3)O(4) nanorods exhibited outstanding gas sensing characteristics such as, higher gas response (approximately 6.55-50 ppm CO gas at 250 degrees C), extremely rapid response (approximately 3-4s), fast recovery (approximately 5-6s), excellent repeatability, good selectivity and lower operating temperature (approximately 250 degrees C). Furthermore, the Co(3)O(4) nanorods are able to detect up to 5 ppm for CO with reasonable sensitivity (approximately 3.32) at an operating temperature 250 degrees C and they can be reliably used to monitor the concentration of CO over the range (5-50 ppm). The experimental results clearly demonstrate the potential of using the Co(3)O(4) nanorods as sensing material in the fabrication of CO sensors. Plausible CO sensing mechanism of the Co(3)O(4) nanorods is also discussed.

摘要

钴（III）氧化物纳米棒（直径约为 6-8nm，长度约为 20-30nm）首次通过简单的共沉淀/消化法在空气中煅烧碳酸羟基钴合成，并研究了其 CO 气敏性能。钴（III）氧化物纳米棒表现出优异的气敏特性，例如，更高的气体响应（在 250°C 时约为 6.55-50ppm CO 气体），极其快速的响应（约 3-4s），快速恢复（约 5-6s），良好的重复性，良好的选择性和较低的工作温度（约 250°C）。此外，钴（III）氧化物纳米棒在 250°C 的工作温度下能够检测到高达 5ppm 的 CO，具有合理的灵敏度（约 3.32），并且可以可靠地用于监测 CO 的浓度在（5-50ppm）范围内。实验结果清楚地表明，钴（III）氧化物纳米棒作为 CO 传感器制造中的传感材料具有潜力。还讨论了钴（III）氧化物纳米棒的合理 CO 传感机制。