期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 200, 期 -, 页码 47-52出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2014.03.085
关键词
Micro-electrode; Micro-cylinder electrode; Nanoparticle voltammetry; Detection limit; Silver nanoparticles
资金
- ERC
- Marie Curie Intra European Fellowship
- European Union's Seventh Framework Programme (FP)/ERC [320403]
Electrochemical impact experiments can be used to detect and size single nanoparticles in suspension and at low concentrations. This is generally performed using a micro-disc working electrode; however, for the first time we report the use of cylindrical micro-wire electrodes for nanoparticle impact experiments. These electrodes provide much enhanced detection limits; specifically decreasing the concentration of nanoparticles measurable by over two orders of magnitude. In addition, the use of micro-wire electrodes reduces the shielding effect due to absorption of particles to the insulating sheath that surrounds a micro-disc electrode. Micro-wire electrodes are fabricated and their electrochemical response analysed via cyclic voltammetry experiments using molecular species. This provides a theoretical framework which is used to calculate the reduced concentration of nanoparticles required for an impact experiment at a micro-cylinder electrode in comparison to the micro-disc. Experimentally, it is demonstrated that impact experiments on the micro-cylinder electrodes can indeed be used for accurate characterisation of ultra-low concentrations (approximate to 0.1 pM) of silver nanoparticles. (C) 2014 Elsevier B.V. All rights reserved.
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