Vallejos Stella, Selina Soultana, Annanouch Fatima Ezahra, Gràcia Isabel, Llobet Eduard, Blackman Chris
SIX Research Centre, Brno University of Technology, Technická 10, Brno, CZ-61600, Czech Republic.
Department of Chemistry, University College London, 20 Gordon Street, London, WC1H 0AJ, UK.
Sci Rep. 2016 Jun 23;6:28464. doi: 10.1038/srep28464.
Tin oxide nanorods (NRs) are vapour synthesised at relatively lower temperatures than previously reported and without the need for substrate pre-treatment, via a vapour-solid mechanism enabled using an aerosol-assisted chemical vapour deposition method. Results demonstrate that the growth of SnO2 NRs is promoted by a compression of the nucleation rate parallel to the substrate and a decrease of the energy barrier for growth perpendicular to the substrate, which are controlled via the deposition conditions. This method provides both single-step formation of the SnO2 NRs and their integration with silicon micromachined platforms, but also allows for in-situ functionalization of the NRs with gold nanoparticles via co-deposition with a gold precursor. The functional properties are demonstrated for gas sensing, with microsensors using functionalised NRs demonstrating enhanced sensing properties towards H2 compared to those based on non-functionalised NRs.
通过气溶胶辅助化学气相沉积法实现的气固机制，在比先前报道的温度相对更低的条件下，且无需对衬底进行预处理，即可气相合成氧化锡纳米棒（NRs）。结果表明，二氧化锡纳米棒的生长是通过平行于衬底的成核速率压缩以及垂直于衬底的生长能垒降低来促进的，这是通过沉积条件来控制的。该方法不仅能一步形成二氧化锡纳米棒并将其与硅微加工平台集成，还能通过与金前驱体共沉积，实现纳米棒与金纳米颗粒的原位功能化。通过气体传感展示了其功能特性，与基于未功能化纳米棒的微传感器相比，使用功能化纳米棒的微传感器对氢气表现出增强的传感特性。
