elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Privacy Policy | Contact | Deutsch
Fontsize: [-] Text [+]

Cost-effective fabrication of polycrystalline TiO2 with tunable n/p response for selective hydrogen monitoring

Haidry, Azhar Ali and Sun, Linchao and Saruhan-Brings, Bilge and Plecenik, Andrej and Plecenik, Thomas and Shen, Honglie and Yao, Zhengjun (2018) Cost-effective fabrication of polycrystalline TiO2 with tunable n/p response for selective hydrogen monitoring. Sensors and Actuators B-Chemical, 274, pp. 10-21. Elsevier. DOI: 10.1016/j.snb.2018.07.082. ISSN 0925-4005

[img] PDF
2MB

Abstract

In this report, we demonstrate a simple and cost-effective strategy to prepare polycrystalline rutile TiO2 based gas sensors with tunable n/p type response inversion depending on gas concentration, operating temperature, and applied voltage. The effect of surface modification by Ag and Ni thin film on structural, morphological, and gas sensor characteristics is studied in detail. The sensors show excellent sensing performance in terms of sensitivity (sensor response∼25 for 0.1 vol. % H2 diluted in technical air), selectivity (selectivity factor for 0.1 vol. % H2 is about ∼24 against NH3, CH4, and NO2 and ∼8 for CO in the same concentration range), stability (both long-term and short-term), and reaction times (∼0.7 min for 0.1 vol. % H2). The aforementioned performance is recorded at 300 °C with applied voltage of 0.1 V. Excluding the power consumption of sensor heater (typically ∼5 × 10−5 watt), this applied voltage 0.1 V can reduce the power consumption to 3 × 10−10 watt. For the first time, we found a critical point, defined with critical-concentration (Cc), critical-temperature (Tc) and criticalvoltage (VC), at which the response inverses from one kind to another, something intriguing to novel sensing phenomena that can be exploited to tailor the selectivity of the sensors. A physical-chemical sensing model is presented to understand the aforesaid peculiar occurrence.

Item URL in elib:https://elib.dlr.de/122839/
Document Type:Article
Title:Cost-effective fabrication of polycrystalline TiO2 with tunable n/p response for selective hydrogen monitoring
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Haidry, Azhar AliUNSPECIFIEDUNSPECIFIED
Sun, LinchaoUNSPECIFIEDUNSPECIFIED
Saruhan-Brings, BilgeBilge.Saruhan (at) dlr.deUNSPECIFIED
Plecenik, AndrejUNSPECIFIEDUNSPECIFIED
Plecenik, ThomasUNSPECIFIEDUNSPECIFIED
Shen, HonglieUNSPECIFIEDUNSPECIFIED
Yao, ZhengjunUNSPECIFIEDUNSPECIFIED
Date:2018
Journal or Publication Title:Sensors and Actuators B-Chemical
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:No
Volume:274
DOI :10.1016/j.snb.2018.07.082.
Page Range:pp. 10-21
Publisher:Elsevier
Series Name:Elsevier
ISSN:0925-4005
Status:Published
Keywords:Gas sensor, Memristor, TiO2, Doping, Hydrogen
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:rotorcraft
DLR - Research area:Aeronautics
DLR - Program:L RR - Rotorcraft Research
DLR - Research theme (Project):L - The Robust Rotorcraft
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > High Temperature and Functional Coatings
Deposited By: Saruhan-Brings, Dr. Bilge
Deposited On:09 Nov 2018 11:37
Last Modified:06 Sep 2019 15:21

Repository Staff Only: item control page

Browse
Search
Help & Contact
Information
electronic library is running on EPrints 3.3.12
Copyright © 2008-2017 German Aerospace Center (DLR). All rights reserved.