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Single Nanomaterial Level Investigation of ZnO Nanorod Sulfidation Reaction via Position Resolved Confocal Raman Spectroscopy

Abstract

Zinc oxide (ZnO) nanomaterials have been used as desulfurizing sorbents for gaseous streams, zinc sulfide (ZnS)-forming template lattices in nanomaterial synthesis, and agriculturally produced sulfur (S)-removing reagents from the environment. Although various nanoscale forms of ZnO are already utilized widely for such purposes, there is currently a lack of fundamental insight into sulfidation of ZnO nanomaterials provided at the single nanocrystal level. We demonstrate that position-resolved confocal Raman spectroscopy can be successfully used to reveal the sulfidation process of ZnO NRs occurring at the single nanomaterial level. We attain single crystal level understanding on facet-dependent sulfidation reactivity of ZnO NRs by tracking the same NRs with Raman spectroscopy before and after sulfidation reaction and quantitatively analyzing various ZnS-induced phonon scattering intensities from different positions on the NRs. The trend in NR facet-dependent sulfidation reactivity is further substantiated by correlating with the electron microscopy and fluorescence data measured from the same NRs. Insight from this study may provide a much-needed fundamental knowledge base for designing optimal ZnO nanostructures beneficial to many technological and industrial applications exploiting the ZnO to ZnS conversion. Taken together with the well-established methods to synthesize ZnO nanomaterials of specific crystal shapes and structures, our findings from the study may be broadly applicable in formulating and optimizing more advanced, low-dimensional ZnO sorbents and scrubbers for highly effective S removal.

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Publication details

The article was received on 26 Jul 2018, accepted on 03 Dec 2018 and first published on 03 Dec 2018


Article type: Paper
DOI: 10.1039/C8NR06039H
Citation: Nanoscale, 2018, Accepted Manuscript
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    Single Nanomaterial Level Investigation of ZnO Nanorod Sulfidation Reaction via Position Resolved Confocal Raman Spectroscopy

    M. Hansen, J. Truong, B. Szychowski, T. Xie, M. Daniel and J. Hahm, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR06039H

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