Abstract
Single step, on-chip fabrication of 1D aligned Au functionalized heterojunction ZnO nanofibers via coaxial electrospinning with in situ photoreduction has been demonstrated.
Highlights
Metal oxide semiconductor (MOS) based heterojunction nanostructures have been extensively used for a wide range of fascinating applications in the emerging fields of oxidation catalysis,[1] photocatalytic degradation,[2] CO oxidation,[3] photoelectrochemical water splitting,[4] toxic gas detection[5] etc
While the catalytic behaviour promote the spill-over effect and localized surface plasmon resonance (LSPR) originating from noble metal nanoislands anchored on 1D ZnO nanofibers can effectively enhance the NO2 sensing properties, it can further trigger its performance owing to its 1D structure
The superior sensor response was due to abundant active sites through nanograined morphology and presence of Au nanocatalyst sites that can seize more OÀ ions by spill-over effect on the ZnO surface leading to the development of larger potential barrier with more electron donors, along with the directed electron transport due to its 1D aligned structure
Summary
Metal oxide semiconductor (MOS) based heterojunction nanostructures have been extensively used for a wide range of fascinating applications in the emerging fields of oxidation catalysis,[1] photocatalytic degradation,[2] CO oxidation,[3] photoelectrochemical water splitting,[4] toxic gas detection[5] etc. Direct on-chip fabrication of aligned MOS based heterojunction nanofibers using coaxial electrospinning for NO2 sensor applications has not yet been reported In this investigation, we have developed one dimensionally aligned ZnO-GNI nanofibers as a model heterojunction nanosystem, where the effect of catalytic sensitization and structural orientation can be achieved to understand their complex sensing mechanism that affects the sensor device performance. To the best of our knowledge, this is the first report on on-chip, single step fabrication of aligned ZnO-GNI HNFs for NO2 gas sensor application and operando PL spectral analysis during electrical characteristics acquisition This investigation can contribute greatly to the choice of better sensing materials and processing conditions for sensor device fabrication and can pave the way for the development of low-cost aligned single nanowire devices with improved selectivity
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