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Open AccessArticle

Highly Sensitive Humidity Sensor Based on Oblique Carbon Nanoplumes

1
Chongqing Key Laboratory of Non-Linear Circuit and Intelligent Information Processing, College of Electronic and Information Engineering, Southwest University, Chongqing 400715, China
2
Chongqing Key Laboratory of Multi-Scale Manufacturing Technology, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China
*
Author to whom correspondence should be addressed.
Sensors 2018, 18(10), 3407; https://doi.org/10.3390/s18103407
Received: 19 August 2018 / Revised: 21 September 2018 / Accepted: 27 September 2018 / Published: 11 October 2018
(This article belongs to the Section Chemical Sensors)
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Abstract

In this work, we fabricated three carbon nanoplume structured samples under different temperatures using a simple hot filament physical vapor deposition (HFPVD) process, and investigated the role of surface morphology, defects, and graphitic content on relative humidity (RH) sensing performances. The Van der Drift growth model and oblique angle deposition (OAD) technique of growing a large area of uniformly aligned and inclined oblique arrays of carbon nanoplumes (CNPs) on a catalyst-free silicon substrate was demonstrated. The optimal growing temperature of 800 °C was suitable for the formation of nanoplumes with larger surface area, more defect sites, and less graphitic content, compared to the other samples that were prepared. As expected, a low detection limit, high response, capability of reversible behavior, and rapid response/recovery speed with respect to RH variation, was achieved without additional surface modification or chemical functionalization. The holes’ depletion has been described as a RH sensing mechanism that leads to the increase of the conduction of the CNPs with increasing RH levels. View Full-Text
Keywords: carbon nanomaterial; hot filament physical vapor deposition; humidity sensor carbon nanomaterial; hot filament physical vapor deposition; humidity sensor
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Qiao, S.; Peng, X.; Wang, L.; Duan, S.; Chu, J.; Jia, P. Highly Sensitive Humidity Sensor Based on Oblique Carbon Nanoplumes. Sensors 2018, 18, 3407.

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