journal article·2020-09-03Open access

Direct Imaging of Liquid–Nanoparticle Interfaces with Atom Probe Tomography

Shi Qiu, Changxi Zheng, Qi Zhou, Dashen Dong, Qianqian Shi, Vivek Garg, Wenlong Cheng, Ross K.W. Marceau, Gang Sha, Jing Fu

The Journal of Physical Chemistry C· Volume 124· Issue 35

Abstract

Understanding the structure and chemical composition at the liquid–nanoparticle (NP) interface is crucial for a wide range of physical, chemical, and biological processes. In this study, direct imaging of the liquid–NP interface by atom probe tomography (APT) is reported for the first time, which reveals the distributions and the interactions of key atoms and molecules in this critical domain. The APT specimen is prepared by controlled graphene encapsulation of the solution containing nanoparticles on a metal tip, with an end radius in the range of 50 nm to allow field evaporation. Using gold nanoparticles (AuNPs) in suspension as an example, analysis of the mass spectrum and three-dimensional (3D) chemical maps from APT provides a detailed image of the water–gold interface at near-atomic resolution. A locally dense region of Au + ions has been reconstructed, representing a portion of an individual AuNP. A large number of water-related ions have also been identified, confirming the AuNP in the hydrated state. At the water–gold interface, a trisodium citrate layer has been observed based on Na + and C-containing ions.
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Research context

OpenAlex topics: Advanced Materials Characterization Techniques · Force Microscopy Techniques and Applications · Diamond and Carbon-based Materials Research

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

Affiliations

Department of Mechanical and Aerospace Engineering, Monash University, Clayton, Victoria 3800, Australia

Institute of Natural Sciences, Westlake Institute of Advanced Study, Westlake University, Zhejiang, Hangzhou 310024, China

School of Materials Science and Engineering/Herbert Gleiter Institute of Nanoscience, Nanjing University of Science and Technology, Xiaolingwei 200, Nanjing, Jiangsu, 210094 China

Functional Materials and Microsystems Research Group and the Micro Nano Research Facility, RMIT University, Melbourne, Victoria 3001, Australia

Department of Chemical Engineering, Monash University, Clayton, Victoria 3800, Australia

IITB-Monash Research Academy, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India

Institute for Frontier Materials, Deakin University, Geelong, Victoria 3216, Australia

ARC Centre of Excellence for Advanced Molecular Imaging, Monash University, Clayton, Victoria 3800, Australia

Funding

Monash University · Australian Research Council

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