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Langmuir. 2014 Mar 4;30(8):2206-15. doi: 10.1021/la404419h. Epub 2014 Feb 21.

Thermoporometry characterization of silica microparticles and nanowires.

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  • 1NUS Graduate School for Integrative Sciences and Engineering, National University of Singapore , Singapore 117456.

Abstract

We present the results of a systematic study on the porosity of silica microparticles and nanowires prepared by glancing angle deposition-metal-assisted chemical etching (GLAD-MACE) and interference lithography-metal-assisted chemical etching (IL-MACE) techniques using the thermoporometry (TPM) method. Good agreement was obtained between our TPM results and published data provided by the suppliers of silica microparticles. TPM characterization of the GLAD-MACE and IL-MACE nanowires was carried out on the basis of parameters obtained from TPM experiments on microparticles. Our nanowires showed a similar trend but lower values of the pore volume and surface area than nanowires prepared by MACE with AgNO3 solution. We attribute the enhanced bioanalysis performance of the GLAD-MACE nanowires based devices to the increased pore volume and total surface area of the nanowires.

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