Ultrafine Tungsten Oxide Nanowires : Synthesis and Highly Selective Acetone Sensing and Mechanism Analysis

By using WCl6 as a precursor and absolute ethanol as a solvent, ultrafine W18O49 nanowires (UFNWs) were synthesized by a one-pot solution-phase method and used as gas sensing materials. Their crystal structure, morphology, and specific surface area can be regulated by controlling precisely the content of the WCl6 precursor in the solution. It has been found that, when the content of the precursor is 4 mg/mL, the formed products are UFNWs with a diameter of about 0.8 nm, only one crystal plane [010] is exposed, and the specific surface area is 194.72 m2/g. After the gas sensing test, we found that they have excellent selectivity to acetone. The response of 50 ppm acetone reaches 48.6, the response and recovery times are 11 and 13 s, respectively. In order to evaluate the interaction between W18O49 surfaces and different volatile organic compound (VOC) molecules, we simulated and calculated the adsorption energy (EAds) among different W18O49 surfaces and different VOCs by DFT. The calculated results are in agreement with the experimental results, further confirming the ultrahigh selectivity of W18O49 UFNWs to acetone. The above results demonstrate that the high selectivity of W18O49 UFNWs to acetone is due to the exposure of its single crystal plane [010]. This work has practical significance for better detection of acetone.

Medienart:

E-Artikel

Erscheinungsjahr:

2020

Erschienen:

2020

Enthalten in:

Zur Gesamtaufnahme - volume:12

Enthalten in:

ACS applied materials & interfaces - 12(2020), 3 vom: 22. Jan., Seite 3755-3763

Sprache:

Englisch

Beteiligte Personen:

Zhang, Wenshuang [VerfasserIn]
Fan, Yu [VerfasserIn]
Yuan, Tongwei [VerfasserIn]
Lu, Bo [VerfasserIn]
Liu, Yiming [VerfasserIn]
Li, Zhixin [VerfasserIn]
Li, Gaojie [VerfasserIn]
Cheng, Zhixuan [VerfasserIn]
Xu, Jiaqiang [VerfasserIn]

Links:

Volltext

Themen:

Acetone gas sensor
High selectivity
Journal Article
Mechanism
Ultrafine nanowires
W18O49

Anmerkungen:

Date Completed 23.01.2020

Date Revised 23.01.2020

published: Print-Electronic

Citation Status PubMed-not-MEDLINE

doi:

10.1021/acsami.9b19706

funding:

Förderinstitution / Projekttitel:

PPN (Katalog-ID):

NLM304556688