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Title: Interference Provides Clarity: Direct Observation of 2D Materials at Fluid–Fluid Interfaces

Abstract

Monolayer particles of two-dimensional (2D) materials represent a scientifically and technologically interesting class of anisotropic particles with colloidal-scale lateral sizes but sub-nanometer thicknesses. This atomic-scale thickness leads to interesting phenomena that can be exploited in next-generation thin-film technologies, and fluid-fluid interfaces provide a potentially scalable platform to confine, assemble, and deposit functional thin films of 2D materials. However, directly observing how these materials interact and assemble into a given film morphology is experimentally challenging because of their sub-nanometer thicknesses. Here, we demonstrate the ability to directly observe graphene, molybdenum disulfide (MoS2), and hexagonal boron nitride (h-BN) particles at fluid-fluid interfaces using interference reflection microscopy (IRM). Monolayer MoS2 and graphene particles demonstrated >10% optical contrast at an air-water interface, which allowed us to quantitatively analyze in situ images of self-assembled MoS2 particles and to map trajectories of interacting graphene particles. Additionally, the Brownian motion of a graphene particle was tracked and analyzed in the context of passive microrheology theory for 2D particle probes. Our results demonstrate how IRM can be used to obtain quantitative spatiotemporal information regarding the self-assembly and dynamics of 2D materials at fluid-fluid interfaces. It will have a significant impact on our ability to investigate systems of atomicallymore » thin particles at fluid-fluid interfaces, an area that has fundamental scientific importance and materials science applications but has suffered from a lack of direct, in situ observation techniques.« less

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [2];  [1]
  1. Colorado School of Mines, Golden, CO (United States)
  2. National Renewable Energy Lab. (NREL), Golden, CO (United States)
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1592391
Report Number(s):
NREL/JA-5900-74799
Journal ID: ISSN 1936-0851
Grant/Contract Number:  
AC36-08GO28308
Resource Type:
Accepted Manuscript
Journal Name:
ACS Nano
Additional Journal Information:
Journal Volume: 14; Journal Issue: 1; Journal ID: ISSN 1936-0851
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 2D material; fluid-fluid interface; interference reflection microscopy; anisotropic particle; graphene; molybdenum disulfide; hexagonal boron nitride

Citation Formats

Goggin, David M., Zhang, Hanyu, Miller, Elisa M., and Samaniuk, Joseph R.. Interference Provides Clarity: Direct Observation of 2D Materials at Fluid–Fluid Interfaces. United States: N. p., 2019. Web. https://doi.org/10.1021/acsnano.9b07776.
Goggin, David M., Zhang, Hanyu, Miller, Elisa M., & Samaniuk, Joseph R.. Interference Provides Clarity: Direct Observation of 2D Materials at Fluid–Fluid Interfaces. United States. https://doi.org/10.1021/acsnano.9b07776
Goggin, David M., Zhang, Hanyu, Miller, Elisa M., and Samaniuk, Joseph R.. Tue . "Interference Provides Clarity: Direct Observation of 2D Materials at Fluid–Fluid Interfaces". United States. https://doi.org/10.1021/acsnano.9b07776. https://www.osti.gov/servlets/purl/1592391.
@article{osti_1592391,
title = {Interference Provides Clarity: Direct Observation of 2D Materials at Fluid–Fluid Interfaces},
author = {Goggin, David M. and Zhang, Hanyu and Miller, Elisa M. and Samaniuk, Joseph R.},
abstractNote = {Monolayer particles of two-dimensional (2D) materials represent a scientifically and technologically interesting class of anisotropic particles with colloidal-scale lateral sizes but sub-nanometer thicknesses. This atomic-scale thickness leads to interesting phenomena that can be exploited in next-generation thin-film technologies, and fluid-fluid interfaces provide a potentially scalable platform to confine, assemble, and deposit functional thin films of 2D materials. However, directly observing how these materials interact and assemble into a given film morphology is experimentally challenging because of their sub-nanometer thicknesses. Here, we demonstrate the ability to directly observe graphene, molybdenum disulfide (MoS2), and hexagonal boron nitride (h-BN) particles at fluid-fluid interfaces using interference reflection microscopy (IRM). Monolayer MoS2 and graphene particles demonstrated >10% optical contrast at an air-water interface, which allowed us to quantitatively analyze in situ images of self-assembled MoS2 particles and to map trajectories of interacting graphene particles. Additionally, the Brownian motion of a graphene particle was tracked and analyzed in the context of passive microrheology theory for 2D particle probes. Our results demonstrate how IRM can be used to obtain quantitative spatiotemporal information regarding the self-assembly and dynamics of 2D materials at fluid-fluid interfaces. It will have a significant impact on our ability to investigate systems of atomically thin particles at fluid-fluid interfaces, an area that has fundamental scientific importance and materials science applications but has suffered from a lack of direct, in situ observation techniques.},
doi = {10.1021/acsnano.9b07776},
journal = {ACS Nano},
number = 1,
volume = 14,
place = {United States},
year = {2019},
month = {12}
}

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