Next Article in Journal
The Trans Influence in Unsymmetrical Pincer Palladacycles: An Experimental and Computational Study
Next Article in Special Issue
Synthesis and Structure Determination of the Quaternary Zinc Nitride Halides Zn2NX1−yX′y (X, X′ = Cl, Br, I; 0 < y < 1)
Previous Article in Journal
Anion Ordering in Bichalcogenides
Article Menu

Export Article

Open AccessArticle

Mesoporous WN/WO3-Composite Nanosheets for the Chemiresistive Detection of NO2 at Room Temperature

Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139-4307, USA
Author to whom correspondence should be addressed.
Academic Editor: Rainer Niewa
Inorganics 2016, 4(3), 24;
Received: 13 June 2016 / Revised: 11 July 2016 / Accepted: 21 July 2016 / Published: 26 July 2016
(This article belongs to the Special Issue Novel Solid-State Nitride Materials)
PDF [2740 KB, uploaded 26 July 2016]


Composite materials, which can optimally use the advantages of different materials, have been studied extensively. Herein, hybrid tungsten nitride and oxide (WN/WO3) composites were prepared through a simple aqueous solution route followed by nitriding in NH3, for application as novel sensing materials. We found that the introduction of WN can improve the electrical properties of the composites, thus improving the gas sensing properties of the composites when compared with bare WO3. The highest sensing response was up to 21.3 for 100 ppb NO2 with a fast response time of ~50 s at room temperature, and the low detection limit was 1.28 ppb, which is far below the level that is immediately dangerous to life or health (IDLH) values (NO2: 20 ppm) defined by the U.S. National Institute for Occupational Safety and Health (NIOSH). In addition, the composites successfully lower the optimum temperature of WO3 from 300 °C to room temperature, and the composites-based sensor presents good long-term stability for NO2 of 100 ppb. Furthermore, a possible sensing mechanism is proposed. View Full-Text
Keywords: WN/WO3 composite; nanosheets; gas sensor; NO2; room temperature WN/WO3 composite; nanosheets; gas sensor; NO2; room temperature

Graphical abstract

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).

Supplementary material


Share & Cite This Article

MDPI and ACS Style

Qu, F.; He, B.; Guarecuco, R.; Yang, M. Mesoporous WN/WO3-Composite Nanosheets for the Chemiresistive Detection of NO2 at Room Temperature. Inorganics 2016, 4, 24.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics



[Return to top]
Inorganics EISSN 2304-6740 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top