Tuning Hydrogen Adsorption on Graphene by Gate Voltage

Abstract

In order to realize applications of hydrogen-adsorbed graphene, a main issue is how to control hydrogen adsorption/desorption at room temperature. In this study, we demonstrate the possibility to tune hydrogen adsorption on graphene by applying a gate voltage. The influence of the gate voltage on graphene and its hydrogen adsorption properties was investigated by electrical transport measurements, scanning tunneling microscopy, and density functional theory calculations. We show that more hydrogen adsorbs on graphene with negative gate voltage (p-type doping), compared to that without gate voltage or positive gate voltage (n-type doping). Theoretical calculations explain the gate voltage dependence of hydrogen adsorption as modifications of the adsorption energy and diffusion barrier of hydrogen on graphene by charge doping.

Investigation on Tunable and Enhanced Optical Properties with Graphene Metamaterials

“…Graphene metamaterials exhibit many exotic physical phenomena because of its electrons in graphene behaving like massless Dirac fermions . Fermi energy of graphene can be effectively regulated by adjusting the electric field. , To make a thorough study on the tunable PIT effect, the transmission spectra with different E F are explored elaborately in Figure . It can be clearly observed that the PIT window demonstrates a distinct blue shift as the E F varies from 0.9 to 1.2 eV, namely, the transparency window moves into the higher frequency region with a larger E F .…”

A Perspective on Recent Advances in Phosphorene Functionalization and Its Applications in Devices

“…Although particularly interesting in view of the high thermal conductivity and carrier mobility, graphene suffers from the lack of an electronic band gap, achieved only through breaking of crystal symmetry, e.g. via hydrogenation or application of an electric field . Research on graphene triggered the discovery of new 2D materials, and, among them, exfoliated bP seems to be particularly appealing in view of its band gap, the value of which depends on the number of stacked layers.…”

“…via hydrogenation or application of an electric field. [13] Research on graphene triggered the discovery of new 2D materials, and, among them, exfoliated bP seems to be particularly appealing in view of its bandgap, the value of which depends on the number of stacked layers. In this regard, the direct bandgap may be tuned from 0.3 eV for bulk bP up to ca.…”

Зависимость Электронной Структуры Графеновой Наноленты От Концентрации Адсорбированных Частиц

“…Для того чтобы создать щель, нужно нарушить условия идеальности [4,5]. Одним из способов является адсорбция чужеродных атомов [6][7][8]. Подавляющее число теоретических работ по адсорбции на графене выполнено в рамках DFT (density functional theory) [6][7][8][9][10].…”

“…Одним из способов является адсорбция чужеродных атомов [6][7][8]. Подавляющее число теоретических работ по адсорбции на графене выполнено в рамках DFT (density functional theory) [6][7][8][9][10]. Здесь мы рассмотрим взаимодействующие между собой адчастицы при различных их концентрациях, воспользовавшись для этого методом функций Грина [11,12].…”