Plasmon-free SERS detection of environmental CO2 on TiO2 surfaces

Nanoscale
Nicolò BontempiIvano Alessandri

Abstract

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.

References

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Citations

Oct 16, 2016·Chemical Reviews·Ivano Alessandri, John R Lombardi
Apr 7, 2017·Nanoscale·Nicolò BontempiDragomir N Neshev
Sep 7, 2017·Chemical Communications : Chem Comm·N BontempiI Alessandri
Aug 11, 2018·Nanoscale·Ying GaoJunsong Liu
Apr 20, 2019·Biosensors·Roberto PilotLaura Fabris
Sep 28, 2018·Nanomaterials·Shuyuan DuLixia Lu
Oct 5, 2019·Nanomaterials·Nina TurkRoel Baets
Jul 15, 2016·Optics Express·V F GiliG Leo
May 26, 2018·Physical Chemistry Chemical Physics : PCCP·Stefano DanesiIvano Alessandri
Nov 7, 2019·Physical Chemistry Chemical Physics : PCCP·Nicolò BontempiLuca Gavioli
Dec 22, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Marziye MirbagheriDae Kun Hwang
Mar 31, 2018·The Journal of Physical Chemistry Letters·Nicolò BontempiIvano Alessandri
Sep 14, 2021·Physical Chemistry Chemical Physics : PCCP·Xiaoyu ZhouZhi Tang

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