DataVXACS Applied Nano MaterialsPaper
journal article·2021-12-24

Isotope Effect of Hydrogen Functionalization in Layered Germanane: Implications for Germanane-Based Optoelectronics

Ruijie Li, Yifei Li, Ying Yang, Xudan Huang, Shengnan Zhang, Huifeng Tian, Xinyu Huang, Zhixin Yao, PeiChi Liao, Shulei Yu, Shizhuo Liu, Zhenjiang Li, Yuan Huang, Junjie Guo, Fuhong Mei, Lifen Wang, Xiao Li, Lei Liu

ACS Applied Nano Materials· Volume 4· Issue 12
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Source abstract

Abstract

Chemical functionalization represents a critical tool for van der Waals (vdW) layered nanomaterials in many aspects, ranging from the monolayer preparation by the solution exfoliation to the modulation of properties. Apart from attaching different chemical groups to one given nanomaterial, much less noticeable but fundamentally attractive is the isotope effect on the functional group, which can in principle tune the physical properties with unconverted chemical behaviors. Here, we report the isotope effect of hydrogen terminations in the layered Ge on lattice vibrations and electronic and atomic structures. We show that the Ge–Ge in-plane vibration responds to the mass variation of hydrogen terminations sensitively in frequencies, providing an indirect path to tune planar phonons through chemical bonds. A significant optical band gap modulation of 40 meV by −H and −D decorations is revealed, and the vdW gap increases by ∼0.3 Å, indicating the modification of layer–layer vdW interactions with isotope effect. The results not only unveil the fundamental isotope effect of hydrogen functionalization but also open up the effective band gap engineering toward germanane-based optoelectronic applications such as photodetectors and photocatalysts.
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Research context

NanomaterialsElectronic materialsCatalysis & surfaces

OpenAlex topics: Graphene research and applications · 2D Materials and Applications · Boron and Carbon Nanomaterials Research

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

School of Materials Science and Engineering, Peking University, Beijing 100871, China

Center for Quantum Transport and Thermal Energy Science, School of Physics and Technology, Nanjing Normal University, Nanjing 210023, China

Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China

Advanced Research Institute of Multidisciplinary Science, Beijing Institute of Technology, Beijing 100081, China

Songshan Lake Laboratory for Materials Science, Dongguan 523000, China

Interdisciplinary Institute of Light-Element Quantum Materials and Research Center for Light-Element Advanced Materials, Peking University, Beijing 100871, China

Funding

Ministry of Science and Technology of the People's Republic of China · Natural Science Foundation of Beijing Municipality · Youth Innovation Promotion Association of the Chinese Academy of Sciences · National Natural Science Foundation of China

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