Recently various porous organic frameworks (POFs, crystalline or amorphous materials) have been discovered, and used for a wide range of applications, including molecular separations and catalysis. Silicon nanowires (SiNWs) have been extensively studied for diverse applications, including as transistors, solar cells, lithium ion batteries and sensors. Here we demonstrate the functionalization of SiNW surfaces with POFs and explore its effect on the electrical sensing properties of SiNW-based devices. The surface modification by POFs was easily achieved by polycondensation on amine-modified SiNWs. Platinum nanoparticles were formed in these POFs by impregnation with chloroplatinic acid followed by chemical reduction. The final hybrid system showed highly enhanced sensitivity for methanol vapour detection. We envisage that the integration of SiNWs with POF selector layers, loaded with different metal nanoparticles will open up new avenues, not only in chemical and biosensing, but also in separations and catalysis.
|Original language||English (US)|
|Number of pages||8|
|State||Published - 2018|
Bibliographical noteKAUST Repository Item: Exported on 2020-10-01
Acknowledgements: The authors thank NanoNextNL, a micro and nanotechnology consortium of the Government of The Netherlands and 130 partners, for their financial support. Laura P. and L. C. P. M. d. S. thank Wetsus – European centre of excellence for sustainable water technology for funding. M. S. and L. C. thank the China Scholarship Council (CSC) for financial support. L. C. P. M. d. S. acknowledges the European Research Council (ERC) for a Consolidator Grant, which is part of the European Union's Horizon 2020 research and innovation programme (grant agreement no 682444). We also thank Mr Duco Bosma and Mr Bart Boshuizen from TU Delft for technical and LabVIEW support and Mr Tiny Verhoeven (TU Eindhoven) for performing some of the XPS measurements.