Nanosheet-assembled hierarchical SnO2 nanostructures for efficient gas-sensing applications

Tianming Li, Wen Zeng, Huiwu Long, Zhongchang Wang

    Research output: Contribution to journalArticle

    60 Citations (Scopus)

    Abstract

    The manner how nano building blocks assemble into hierarchical architectures exerts a tremendous influence on gas-sensing performance of the metal oxides. Here, we focus on tuning the 2D SnO2 nanosheets into 3D hierarchical nanoflowers by manipulating the presence of NaOH, and investigate their gas-sensing functionalities. We find that the blooming SnO2 nanoflowers assembled by ultrathin nanosheets (∼50 nm) are shrunk into semi-blooming state, and that the semi-blooming nanoflowers based sensor shows enhanced gas-sensing performance towards the ethanol, which is attributed mainly to the confined effect due to numerous nano or micro reaction rooms by keeping oxygen and ethanol molecules to complete gas-sensing reactions. While the semi-blooming nanoflowers turn into ordered mesoporous via thermally removing the periodically arranged polyvinyl pyrrolidone micelles, their gas-sensing performance is found to be improved dramatically, indicating that sufficient amount of gas diffusion is crucial to gas-sensing properties rather than the fast gas diffusion speed. As a final verification, we fabricate the sensors using the mesoporous semi-blooming SnO2 nanoflowers and successfully monitor the existence of beer by a simple integrated device, making it a promising candidate in detecting drunk driving.

    Original languageEnglish
    Pages (from-to)120-128
    Number of pages9
    JournalSensors and Actuators, B: Chemical
    Volume231
    DOIs
    Publication statusPublished - 2016 Aug 1

    Keywords

    • Gas diffusion
    • Metal oxide
    • Nanostructure
    • Oxygen vacancy
    • Sensor

    ASJC Scopus subject areas

    • Electrical and Electronic Engineering
    • Condensed Matter Physics
    • Electronic, Optical and Magnetic Materials
    • Metals and Alloys
    • Surfaces, Coatings and Films
    • Materials Chemistry
    • Instrumentation

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