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Surface potential microscopy of surfactant-controlled single gold nanoparticle

Authors
 Hyungbeen Lee  ;  Yoochan Hong  ;  Dongtak Lee  ;  Seungyeon Hwang  ;  Gyudo Lee  ;  Jaemoon Yang  ;  Dae Sung Yoon 
Citation
 NANOTECHNOLOGY, Vol.31(21) : 215706, 2020-05 
Journal Title
NANOTECHNOLOGY
ISSN
 0957-4484 
Issue Date
2020-05
Abstract
The surface potential of nanoparticles plays a key role in numerous applications, such as drug delivery and cellular uptake. The estimation of the surface potential of nanoparticles as drug carriers or contrast agents is important for the design of nanoparticle-based biomedical platforms. Herein, we report the direct measurement of the surface potential of individual gold nanorods (GNRs) via Kelvin probe force microscopy (KPFM) at the nanoscale. GNRs were capped by a surfactant, cetyltrimethylammonium bromide (CTAB), which was removed by centrifugation. CTAB removal is essential for GNR-based biomedical applications because of the cytotoxicity of CTAB. Applying KPFM analysis, we found that the mean surface potential of the GNRs became more negative as the CTAB was removed from the GNR. The results indicate that the negative charge of GNRs is covered by the electrostatic charge of the CTAB molecules. Similar trends were observed in experiments with gold nanospheres (GNS) capped by citrates. Overall, KPFM-based techniques characterize the surfactant of individual nanoparticles (i.e. GNR or GNS) with high resolution by mapping the surface potential of a single nanoparticle, which aids in designing engineered nanoparticles for biomedical applications.
Full Text
https://iopscience.iop.org/article/10.1088/1361-6528/ab73b7
DOI
10.1088/1361-6528/ab73b7
Appears in Collections:
1. College of Medicine (의과대학) > Dept. of Radiology (영상의학교실) > 1. Journal Papers
Yonsei Authors
Yang, Jae Moon(양재문) ORCID logo https://orcid.org/0000-0001-7365-0395
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/180554
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