A thermally robust and strongly oxidizing surface of WO3hydrate nanowires for electrical aldehyde sensing with long-term stability

Guozhu Zhang, Takuro Hosomi, Wataru Mizukami, Jiangyang Liu, Kazuki Nagashima, Tsunaki Takahashi, Masaki Kanai, Takeharu Sugiyama, Takao Yasui, Yuriko Aoki, Yoshinobu Baba, Johnny C. Ho, Takeshi Yanagida

Research output: Contribution to journalArticlepeer-review


Electrical molecular nanosensors require two conflicting surface characteristics, which are catalytic activity for molecular selectivity and thermal stability for long-term data collection. Here, we show that a simple surface treatment using strong acids creates two such conflicting surface properties of WO3hydrate nanowires, which enhance the electrical molecular sensing of aldehydes (nonanal, a biomarker). Mass-spectrometric measurements reveal that the surface treatment using strong acids substantially promotes both the oxidization of nonanal and the desorption of products, nonanoic acid, from the surfaces at a temperature of 50 °C, which is lower than the 300 °C required for untreated surfaces. Spectroscopic and structural measurements combined with numerical simulations identify two different adsorption structures of carbonyl groups on the surface, where molecules directly bound to coordinatively unsaturated surface tungsten preferentially proceed to the catalytic oxidization reaction and the subsequent desorption process. Furthermore, we confirm the thermal durability (over 10 years) of the catalytic activity on acid-treated WO3hydrate nanowire surfaces up to 300 °C, which enables us to demonstrate the long-term stable sensor operations with the sensitivity (4 orders of magnitude) remaining for years.

Original languageEnglish
Pages (from-to)5815-5824
Number of pages10
JournalJournal of Materials Chemistry A
Issue number9
Publication statusPublished - Mar 7 2021

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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