Synthesis of a Hybrid Nanostructure of ZnO-Decorated MoS2 by Atomic Layer Deposition

Il-Kwon Oh, Woo-Hee Kim, Li Zeng, Joseph Singh, Dowon Bae, Adriaan J. M. Mackus, Jeong-Gyu Song, Seunggi Seo, Bonggeun Shong, Hyungjun Kim, Stacey F. Bent

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We introduce the synthesis of hybrid nanostructures comprised of ZnO nanocrystals (NCs) decorating nanosheets and nanowires (NWs) of MoS2 prepared by atomic layer deposition (ALD). The concentration, size, and surface-to-volume ratio of the ZnO NCs can be systematically engineered by controlling both the number of ZnO ALD cycles and the properties of the MoS2 substrates, which are prepared by sulfurizing ALD MoO3. Analysis of the chemical composition combined with electron microscopy and synchrotron X-ray techniques as a function of the number of ZnO ALD cycles, together with the results of quantum chemical calculations, help elucidate the ZnO growth mechanism and its dependence on the properties of the MoS2 substrate. The defect density and grain size of MoS2 nanosheets are controlled by the sulfurization temperature of ALD MoO3, and the ZnO NCs in turn nucleate selectively at defect sites on MoS2 surface and enlarge with increasing ALD cycle numbers. At higher ALD cycle numbers, the coalescence of ZnO NCs contributes to an increase in areal coverage and NC size. Additionally, the geometry of the hybrid structures can be tuned by changing the dimensionality of the MoS2, by employing vertical NWs of MoS2 as the substrate for ALD ZnO NCs, which leads to improvement of the relevant surface-to-volume ratio. Such materials are expected to find use in newly expanded applications, especially those such as sensors or photodevices based on a p-n heterojunction which relies on coupling transition-metal dichalcogenides with NCs.

Original languageEnglish
Pages (from-to)1757-1769
Number of pages13
JournalACS Nano
Volume14
Issue number2
Early online date22 Jan 2020
DOIs
Publication statusPublished - 25 Feb 2020

Keywords

  • atomic layer deposition
  • hybrid nanostructure
  • ZnO-decorated MoS nanosheets
  • ZnO-decorated MoS nanowires

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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