Preparation of Au-Ag Nanoframe and its Application in SERS

2015 ◽  
Vol 748 ◽  
pp. 71-75
Author(s):  
Shi Li Liu ◽  
Zhi Qing Xin ◽  
Lu Hai Li
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Silver Nanoplates ◽  
Sers Substrates ◽  
Triangular Silver Nanoplates ◽  
Gold Silver ◽  
Facile Preparation ◽  
Self Assembled ◽  
Scanning Electron

A simple and facile preparation approach of gold-silver nanoframes is described based on triangular silver nanoplates. HAuCl4was used as etching agent and added to boiling nanoplates suspension under stirring. Especially, when different concentrations of HAuCl4was employed, various etching happened and corresponding morphology of gold-silver nanoframes were acquired. The properties of nanoframes were characterized by scanning electron microscopy (SEM) and UV-vis spectra. Then the nanoframes were self-assembled onto the silicon treated with APTMS and used as SERS substrates for detecting p-ATP molecules. The results indicated that nanoframes showed better SERS effects than nanoplates.

Comparative Study of Field Emission-Scanning Electron Microscopy and Atomic Force Microscopy to Assess Self-assembled Monolayer Coverage on Any Type of Substrate

1999 ◽  
Vol 5 (6) ◽  
pp. 413-419 ◽  
Author(s):  
Bernardo R.A. Neves ◽  
Michael E. Salmon ◽  
Phillip E. Russell ◽  
E. Barry Troughton
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Atomic Force Microscopy ◽  
Comparative Study ◽  
Field Emission ◽  
Self Assembled Monolayer ◽  
Force Microscopy ◽  
Atomic Force ◽  
Self Assembled ◽  
Scanning Electron

Abstract: In this work, we show how field emission–scanning electron microscopy (FE-SEM) can be a useful tool for the study of self-assembled monolayer systems. We have carried out a comparative study using FE-SEM and atomic force microscopy (AFM) to assess the morphology and coverage of self-assembled monolayers (SAM) on different substrates. The results show that FE-SEM images present the same qualitative information obtained by AFM images when the SAM is deposited on a smooth substrate (e.g., mica). Further experiments with rough substrates (e.g., Al grains on glass) show that FE-SEM is capable of unambiguously identifying SAMs on any type of substrate, whereas AFM has significant difficulties in identifying SAMs on rough surfaces.

scholarly journals Synthesis of Salt Responsive Spherical Polymer Brushes

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Na Su ◽  
Houbin Li ◽  
Yu Huang ◽  
Xiongzhi Zhang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Polymer Brushes ◽  
Hydrodynamic Radius ◽  
Sodium Polystyrene Sulfonate ◽  
Polystyrene Sulfonate ◽  
Carbon Spheres ◽  
Transmission Electron ◽  
Facile Preparation ◽  
Scanning Electron

A facile preparation of novel salt responsive spherical polymer brushes (SPB) consisting of a carbon spheres core and a shell of sodium polystyrene sulfonate (PSSNa) was described. The SPB were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), and thermogravimetric analysis (TGA). The radiusRof carbon spheres and hydrodynamic radiusRhof SPB were ca. 370 nm and 785 nm, respectively. The brushes hadMwof 393600 g/mol with polydispersityMw/Mnof 1.58. Furthermore, the dependence of PSSNa brushes on ionic strength and pH was investigated.

Spanish and Portuguese Gilding Threads: Characterization Using Microscopic Techniques

2018 ◽  
Vol 24 (5) ◽  
pp. 574-590 ◽  
Author(s):  
Jose Luis Perez-Rodriguez ◽  
Antonio Albardonedo ◽  
Maria Dolores Robador ◽  
Adrian Duran
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Precious Metal ◽  
X Ray ◽  
Time Period ◽  
Gold Silver ◽  
Form Part ◽  
Manufacturing Techniques ◽  
Microscopic Techniques ◽  
Scanning Electron

AbstractGilding threads collected from Spanish and Portuguese palaces and from the embroideries and adornments of sculptures of the Virgin and Christ that form part of Sevillian Holy Week were analyzed and compared (20 artifacts were evaluated). The study covered a broad time period with examples from the 13th to 14th centuries, 18th to 20th centuries, and also including modern embroideries. A combination of scanning electron microscopy and energy-dispersive X-ray spectroscopy was used. The knowledge of the layered structures of the threads has provided very valuable information regarding the manufacturing techniques. The different metal threads found in the embroidery studied consisted of gold, silver, copper, and alloys of these metals and aluminium. The fabrication procedures often differed in the different workshops and changed with time. In the modern embroideries, a decrease of precious metal concentration was detected. The threads were wound around a core of silk threads.

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