Vacuum-tuned-atmosphere induced assembly of Au@Ag core/shell nanocubes into multi-dimensional superstructures and the ultrasensitive IAPP proteins SERS detection

Utilizing vacuum-tuned-atmosphere induced dip coating method, we achieve the cross-dimensional macroscopic diverse self-assemblies by using one building block with one chemical functionality. Coordinated modulating the vacuum degree, colloid concentration and evaporation atmosphere, Au@Ag core/shell...

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Bibliographic Details
Published in:Nano research 2019-06, Vol.12 (6), p.1375-1379
Main Authors: Xu, Meng, Tu, Guopeng, Ji, Muwei, Wan, Xiaodong, Liu, Jiajia, Liu, Jia, Rong, Hongpan, Yang, Yanlian, Wang, Chen, Zhang, Jiatao
Format: Article
Language:English
Subjects:
Assemblies
Atmosphere
Atomic/Molecular Structure and Spectra
Biomedicine
Biotechnology
Chemistry and Materials Science
Colloid chemistry
Condensed Matter Physics
Evaporation
Gold
Immersion coating
Materials Science
Nanocrystals
Nanotechnology
Organic chemistry
Polyethylene terephthalate
Polypeptides
Proteins
Research Article
Scanning electron microscopy
Silver
Solvents
Superstructures
Vacuum
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Summary:Utilizing vacuum-tuned-atmosphere induced dip coating method, we achieve the cross-dimensional macroscopic diverse self-assemblies by using one building block with one chemical functionality. Coordinated modulating the vacuum degree, colloid concentration and evaporation atmosphere, Au@Ag core/shell NCs can controllably assemble into diverse multi-dimensional superstructures. Under 0.08 MPa, we obtained the two-dimensional (2D) stepped superstructures with continuously tunable step width. In addition, we generated a series of tailorable nanoscale-roughened 2D Au@Ag NCs superstructures at 0.04 MPa, which exhibited the label-free ultrasensitive SERS detection for the different mutants of IAPP8-37 proteins. Under 0.01 MPa, we obtained the cross-dimensional tailorable Au@Ag NCs assemblies from random to macroscale 2D and three-dimensional (3D) densest superstructures by adjusting the capping ligand-environmental molecule interactions. This is a flexible method to generate as-prepared Au@Ag core/shell NCs into well-defined macroscopic diverse superstructures and to promote the exploitation into biological applications.
ISSN:1998-0124
1998-0000
DOI:10.1007/s12274-019-2325-8