Optical Imaging of Charges with Atomically Thin Molybdenum Disulfide

Hao Zhu, Fenni Zhang, Hui Wang, Zhixing Lu, Hong Yuan Chen, Jinghong Li, Nongjian Tao

Research output: Contribution to journalArticle

Abstract

Mapping local surface charge distribution is critical to the understanding of various surface processes and also allows the detection of molecules binding to the surface. We show here that the optical absorption of monolayer MoS2 is highly sensitive to charge and demonstrate optical imaging of local surface charge distribution with this atomically thin material. We validate the imaging principle and perform charge sensitivity calibration with an electrochemical gate. We further show that binding of charged molecules to the atomically thin material leads to a large change in the image contrast, allowing determination of the charge of the adsorbed molecules. This capability opens possibilities for characterizing impurities and defects in two-dimensional materials and for label-free optical detection and charge analysis of molecules.

Original languageEnglish (US)
JournalACS Nano
DOIs
StateAccepted/In press - Jan 1 2019

Fingerprint

molybdenum disulfides
Molybdenum
Imaging techniques
Molecules
Charge distribution
Surface charge
charge distribution
molecules
image contrast
Light absorption
Labels
Monolayers
optical absorption
Calibration
Impurities
impurities
Defects
molybdenum disulfide
sensitivity
defects

Keywords

  • charge impurities
  • electrochemical gate
  • local charge imaging
  • monolayer molybdenum disulfide
  • protein binding

ASJC Scopus subject areas

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

Cite this

Optical Imaging of Charges with Atomically Thin Molybdenum Disulfide. / Zhu, Hao; Zhang, Fenni; Wang, Hui; Lu, Zhixing; Chen, Hong Yuan; Li, Jinghong; Tao, Nongjian.

In: ACS Nano, 01.01.2019.

Research output: Contribution to journalArticle

Zhu, Hao ; Zhang, Fenni ; Wang, Hui ; Lu, Zhixing ; Chen, Hong Yuan ; Li, Jinghong ; Tao, Nongjian. / Optical Imaging of Charges with Atomically Thin Molybdenum Disulfide. In: ACS Nano. 2019.
@article{3812c50277ec4715bf82e6e19f2b946e,
title = "Optical Imaging of Charges with Atomically Thin Molybdenum Disulfide",
abstract = "Mapping local surface charge distribution is critical to the understanding of various surface processes and also allows the detection of molecules binding to the surface. We show here that the optical absorption of monolayer MoS2 is highly sensitive to charge and demonstrate optical imaging of local surface charge distribution with this atomically thin material. We validate the imaging principle and perform charge sensitivity calibration with an electrochemical gate. We further show that binding of charged molecules to the atomically thin material leads to a large change in the image contrast, allowing determination of the charge of the adsorbed molecules. This capability opens possibilities for characterizing impurities and defects in two-dimensional materials and for label-free optical detection and charge analysis of molecules.",
keywords = "charge impurities, electrochemical gate, local charge imaging, monolayer molybdenum disulfide, protein binding",
author = "Hao Zhu and Fenni Zhang and Hui Wang and Zhixing Lu and Chen, {Hong Yuan} and Jinghong Li and Nongjian Tao",
year = "2019",
month = "1",
day = "1",
doi = "10.1021/acsnano.8b09010",
language = "English (US)",
journal = "ACS Nano",
issn = "1936-0851",
publisher = "American Chemical Society",

}

TY - JOUR

T1 - Optical Imaging of Charges with Atomically Thin Molybdenum Disulfide

AU - Zhu, Hao

AU - Zhang, Fenni

AU - Wang, Hui

AU - Lu, Zhixing

AU - Chen, Hong Yuan

AU - Li, Jinghong

AU - Tao, Nongjian

PY - 2019/1/1

Y1 - 2019/1/1

N2 - Mapping local surface charge distribution is critical to the understanding of various surface processes and also allows the detection of molecules binding to the surface. We show here that the optical absorption of monolayer MoS2 is highly sensitive to charge and demonstrate optical imaging of local surface charge distribution with this atomically thin material. We validate the imaging principle and perform charge sensitivity calibration with an electrochemical gate. We further show that binding of charged molecules to the atomically thin material leads to a large change in the image contrast, allowing determination of the charge of the adsorbed molecules. This capability opens possibilities for characterizing impurities and defects in two-dimensional materials and for label-free optical detection and charge analysis of molecules.

AB - Mapping local surface charge distribution is critical to the understanding of various surface processes and also allows the detection of molecules binding to the surface. We show here that the optical absorption of monolayer MoS2 is highly sensitive to charge and demonstrate optical imaging of local surface charge distribution with this atomically thin material. We validate the imaging principle and perform charge sensitivity calibration with an electrochemical gate. We further show that binding of charged molecules to the atomically thin material leads to a large change in the image contrast, allowing determination of the charge of the adsorbed molecules. This capability opens possibilities for characterizing impurities and defects in two-dimensional materials and for label-free optical detection and charge analysis of molecules.

KW - charge impurities

KW - electrochemical gate

KW - local charge imaging

KW - monolayer molybdenum disulfide

KW - protein binding

UR - http://www.scopus.com/inward/record.url?scp=85060237122&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85060237122&partnerID=8YFLogxK

U2 - 10.1021/acsnano.8b09010

DO - 10.1021/acsnano.8b09010

M3 - Article

JO - ACS Nano

JF - ACS Nano

SN - 1936-0851

ER -