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[[Vol. 63]On_Off Boundary of Photocatalytic Activity between Single- and Bilayer MoS2_ WPI-MANA.pdf](https://mdr.nims.go.jp/filesets/ce570c93-cd44-4041-b2d3-021b3fa5fc6f/download)

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International Center for Materials Nanoarchitectonics (WPI-MANA)

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[[Research Highlights Vol.63] On/Off Boundary of Photocatalytic Activity between Single- and Bilayer MoS2](https://mdr.nims.go.jp/datasets/b64ae644-7e52-4ce4-9a46-18183875f04d)

## Fulltext

2022/03/31 16:20 On/Off Boundary of Photocatalytic Activity between Single- and Bilayer MoS2| MANAhttps://www.nims.go.jp/mana/research/highlights/vol63.html 1/2Previous  Index  NextResearch Highlights[Vol. 63]On/Off Boundary of Photocatalytic Activity between Single- and Bilayer MoS218 Nov, 2020A team at WPI-MANA has succeeded in spatially resolving the photocatalytic activity ofmolybdenum disulfide (MoS2) as a model catalyst. The findings advance ourunderstanding of the potential photocatalytic activity of 2D nanophotocatalysts.Molecularly thin two-dimensional semiconductors are attracting interest as photocatalysts thanksto their layer-number-dependent quantum effects and high charge separation efficiency.However, the correlation among the dimensionality, crystallinity and photocatalytic activity of such2D nanomaterials remains unclear. The team used a silver (Ag) photoreduction technique coupledwith microscopic analyses to spatially resolve the photocatalytic activity of MoS2 as a modelcatalyst.They found that only monolayer (1L)-MoS2 is active for Ag photoreduction reactions. Thephotocatalytic activity of 1L-MoS2 is enhanced by a built-in electrical field originated from theMoS2SiO2 interface, rather than by the specific surface structure and quantum electronic state of1L-MoS2.The team discovered that photocatalytically active sites were geometrically distributed ontriangular 1L-MoS2 crystals, in which the Ag particles are preferentially deposited on the outermostzigzag edges and defective inner parts of the triangular grains. The degradation of photocatalytichttps://www.nims.go.jp/mana/research/highlights/vol62.htmlhttps://www.nims.go.jp/mana/research/highlights/index.htmlhttps://www.nims.go.jp/mana/research/highlights/vol64.html2022/03/31 16:20 On/Off Boundary of Photocatalytic Activity between Single- and Bilayer MoS2| MANAhttps://www.nims.go.jp/mana/research/highlights/vol63.html 2/2activity and electron mobility with the formation of Mo(VI) species indicates that the species inhibitthe in-plane diffusion of the photogenerated electrons to the reductive sites.MoS2 was chosen for the study because it is a useful sunlight-driven photocatalyst. There has beenconsiderable effort recently toward the development of MoS2-based photocatalysts for variousreactions including water splitting, CO2 reduction and bacteria inactivation.The study provides insights into these critical aspects to guide a general design strategy to revealthe potential photocatalytic activity of 2D nanomaterials. The monolayer selectivity, activation andinactivation mechanisms in 1L-MoS2 suggest future directions in designing 2D nanophotocatalysts.This research was carried out by Takaaki Taniguchi (Senior Researcher, Functional NanomaterialsGroup) and his collaborators.Reference“On/Off Boundary of Photocatalytic Activity between Single- and Bilayer MoS2”Takaaki Taniguchi, Leanddas Nurdiwijayanto, Shisheng Li, Hong En Lim, Yasumitsu Miyata, XueyiLu, Renzhi Ma, Dang-Ming Tang, Shigenori Ueda, Kazuhito Tsukagoshi, TakayoshiSasaki and Minoru OsadaJournal: ACS Nano 2020, 14, 6, 6663–6672 (May 12, 2020)DOI : 10.1021/acsnano.9b09253■ MANA E-BULLETINhttps://www.nims.go.jp/mana/ebulletin/AffiliationsInternational Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for MaterialsScience (NIMS), Namiki 1-1, Tsukuba, Ibaraki 305-0044, JapanContact informationInternational Center for Materials Nanoarchitectonics(WPI-MANA)National Institute for Materials Science1-1 Namiki, Tsukuba, Ibaraki 305-0044 JapanPhone: +81-29-860-4710E-mail: mana-pr[AT]ml.nims.go.jphttps://samurai.nims.go.jp/profiles/taniguchi_takaaki?locale=enhttps://samurai.nims.go.jp/profiles/taniguchi_takaaki?locale=enhttps://samurai.nims.go.jp/profiles/nurdiwijayanto_leanddas?locale=enhttps://samurai.nims.go.jp/profiles/ma_renzhi?locale=enhttps://samurai.nims.go.jp/profiles/tang_daiming?locale=enhttps://samurai.nims.go.jp/profiles/tsukagoshi_kazuhito?locale=enhttps://samurai.nims.go.jp/profiles/SASAKI_Takayoshi?locale=enhttps://samurai.nims.go.jp/profiles/osada_minoru?locale=enhttps://doi.org/10.1021/acsnano.9b09253https://www.nims.go.jp/mana/ebulletin/