Here, we report the analytical observations of adsorption behaviour of the most abundant stable isotopes of CO2 (12C16O2, 13C16O2 and 12C16O18O) and H2O vapour (H216O, H217O, H218O and HD16O) in emeraldine salt form of Polyaniline (ES-PANI) using optical cavity-enhanced absorption spectroscopy technique. Isotopic investigation showed a preferential adsorption of the lighter isotope compared with the heavier isotopes of CO2 by PANI, suggesting the mass-dependent isotopic fractionations through the nanomaterial. Our findings also revealed a unique isotope-specific H2O adsorption by PANI. These results shed a new light on the isotope specificity of CO2 and H2O gas molecules adsorbed in nanostructured polymers.
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This work was supported by the Technical Research Centre (TRC) of S. N. Bose National Centre for Basic Sciences, Kolkata (No. All1/64/SNB/2014(C)). A. Bera and A. Maiti would like to thank S. N. Bose National Centre for Basic Sciences, Kolkata for providing Post-Doctoral Research Associate Fellowship during execution of the research work.
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The authors declare that they have no competing financial interests.
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Bera, A., Maiti, A., Maity, A. et al. Exploring C, H and O isotope-specific adsorption of CO2 and H2O vapour in nanostructured polyaniline. MRS Communications (2021). https://doi.org/10.1557/s43579-021-00104-1