Proceedings of nanoGe Fall Meeting 2018 (NFM18)
DOI: https://doi.org/10.29363/nanoge.nfm.2018.073
Publication date: 6th July 2018
Semiconductor nanoparticle (NP) based photoelectrochemical sensors exhibit several advantages over other sensor types, such as a wide analyte range, fast responses, and high sensitivies.1 For the development of systems for multi-analyte detection, not only a spatial structuring of the photoelectrodes, but also the improvement of their sensitivity and their detection range is necessary. Due to their high surface-to-volume ratio, semiconductor nanoplatelets (NPLs) are promising candidates for the application in (multi-analyte) photoelectrochemical sensing devices. The high surface area of the NPLs potentially increases the absolute number of surface trap states per particle, which may lead to an enhanced photoresponse of the NP covered electrode.3 In addition, CdSe NPLs were already shown to assemble into highly porous non-ordered network structures with large surface areas.2 Our work reports on the preparation of different CdSe NPL based 3D assemblies on conductive glass electrodes and the photoelectrochemical characterization of the charge transfer processes across these structures. Electron microscopy revealed that porous NPL gels with different morphologies were obtained via the applied gelation processes. Photocurrents more than one magnitude larger than for simple particle monolayers were detected and the transport of charge carriers was proven by means of intensity modulated photocurrent spectroscopy (IMPS).4
References:
(1) Yue Z. et al., ACS Appl. Mater. Interfaces 2013, 5, 2800−2814.
(2) Naskar, S. et al., Chem. Mater. 2016, 28 (7), 2089–2099.
(3) Spittel, D. et al., ACS Nano 2017, 11 (12), 12174–12184.
(4) Jan F. Miethe, Anja Schlosser et al., submitted.
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