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Issue 6, 2016
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Plasmon-free SERS detection of environmental CO2 on TiO2 surfaces

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SiO2/TiO2 core/shell beads (T-rex) were designed, fabricated and tested for Raman detection of environmental CO2 under real-working conditions, as those encountered, for example, in solar-to-fuel conversion reactions. The exploitation of light trapping and morphology dependent resonances was crucial for extending the limit of detection of CO2 adsorbed on TiO2 surfaces. T-rex beads allowed for achieving surface enhanced Raman scattering (SERS) without using plasmonic metals showing high-efficiency, fast response and reproducibility in CO2 detection in both air and solvents. The dependence of SERS activity on Mie-type resonances was investigated through a systematic comparison of experimental data and numerical simulations, demonstrating that T-rex beads can be tailored for the detection of gaseous environmental pollutants on the basis of simple, Mie-scattering based calculations. Three-dimensional T-rex colloidal crystals were also successfully tested in precise, in situ, real time detection of CO2 as a function of different temperature-sweep cycles.

Graphical abstract: Plasmon-free SERS detection of environmental CO2 on TiO2 surfaces

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Publication details

The article was received on 26 Nov 2015, accepted on 11 Jan 2016 and first published on 11 Jan 2016

Article type: Communication
DOI: 10.1039/C5NR08380J
Nanoscale, 2016,8, 3226-3231

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    Plasmon-free SERS detection of environmental CO2 on TiO2 surfaces

    N. Bontempi, L. Carletti, C. De Angelis and I. Alessandri, Nanoscale, 2016, 8, 3226
    DOI: 10.1039/C5NR08380J

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