Study of the Molecular Bending in Azobenzene Self-Assembled Monolayers Observed by Tip-Enhanced Raman Spectroscopy in Scanning Tunneling Mode

2019 ◽  
Vol 123 (43) ◽  
pp. 26554-26563 ◽  
Author(s):  
A. Foti ◽  
C. Toccafondi ◽  
R. Ossikovski
Keyword(s):  
Raman Spectroscopy ◽  
Self Assembled Monolayers ◽  
Scanning Tunneling ◽  
Assembled Monolayers ◽  
Tunneling Mode ◽  
Self Assembled ◽  
Tip Enhanced Raman Spectroscopy

Tip enhanced Raman spectroscopy on azobenzene thiol self-assembled monolayers on Au(111)

2009 ◽  
Vol 40 (10) ◽  
pp. 1407-1412 ◽  
Author(s):  
Gennaro Picardi ◽  
Marc Chaigneau ◽  
Razvigor Ossikovski ◽  
Christophe Licitra ◽  
Guillame Delapierre
Keyword(s):  
Raman Spectroscopy ◽  
Self Assembled Monolayers ◽  
Assembled Monolayers ◽  
Self Assembled ◽  
Tip Enhanced Raman Spectroscopy

scholarly journals Nanoscale Chemical Imaging of Coadsorbed Thiolate Self-assembled Monolayers on Au(111) by Tip-Enhanced Raman Spectroscopy

2022 ◽  
Author(s):  
Feng Shao ◽  
Liqing Zheng ◽  
Jinggang Lan ◽  
Renato Zenobi
Keyword(s):  
Raman Spectroscopy ◽  
Dft Calculations ◽  
Adsorption Energy ◽  
Density Functional ◽  
Phase Segregation ◽  
Self Assembled Monolayers ◽  
Ambient Conditions ◽  
Assembled Monolayers ◽  
Self Assembled ◽  
Tip Enhanced Raman Spectroscopy

Self-assembled monolayers (SAMs) of thiolates on metal surfaces are of key importance for engineering surfaces with tunable properties. However, it remains challenging to understand binary thiolate SAMs on metals at the nanoscale under ambient conditions. Here we employ tip-enhanced Raman spectroscopy (TERS) and density functional theory (DFT) calculations to investigate local information of binary SAMs on Au(111) coadsorbed from an equimolar mixture of p-cyanobenzenethiol (pCTP) and p-aminothiophenol (pATP), including chemical composition, coadsorption behavior, phase segregation, plasmon-induced photocatalysis, and solvation effects. We found that upon competitive adsorption of pCTP and pATP on Au(111) from a methanolic solution, the coadsorption initially occurs randomly and homogeneously; eventually, pATP is replaced by pCTP through gradual growth of pCTP nanodomains. TERS imaging also allows for visualization of the plasmon-induced coupling of pATP to p,p’-dimercaptoazobenzene (DMAB) and the solvation-induced phase segregation of the binary SAMs into nanodomains, with a spatial resolution of ~9 nm under ambient conditions. According to DFT calculations, these aromatic thiolates differing only in their functional groups, -CN versus –NH2, show different adsorption energy on Au(111) in vacuum and methanol, and thus the solvation effect on adsorption energy of these thiolates in methanol can determine the dispersion state and replacement order of the binary thiolates on Au(111).

Specific Immobilization of Streptavidin on Mixed Self-Assembled Monolayers as Mixing Ratio

2007 ◽  
Vol 121-123 ◽  
pp. 495-498 ◽  
Author(s):  
Jun Hyung Park ◽  
Buyng Su Park ◽  
Gu Huh ◽  
Seung Hyun Lee ◽  
Hyun Sook Lee ◽  
...  
Keyword(s):  
Colorimetric Detection ◽  
Gold Surface ◽  
Self Assembled Monolayers ◽  
Scanning Tunneling ◽  
Local Domain ◽  
Mixing Ratio ◽  
Tunneling Microscopy ◽  
Self Assembled Monolayer ◽  
Assembled Monolayers ◽  
Self Assembled

We report on the distribution of mixed self-assembled monolayers (SAMs) composed of biotinylated and diluent alkylthiolates for streptavidin immobilization. Two thiol derivatives, 11-mercapto-1-undecanol (MUOH) and 11-mercaptoundecanoic-(8-biotinylamido-3,6-dioxaoctyl) amide (MBDA), were employed for mixed SAM. These thiols formed self-assembled monolayer without local domain, and streptavidins were immobilized onto biotinylated gold surface without nonspecific binding. In order to find the optimized condition of immobilization of streptavidin, we controlled the mixing ratio of two kind thiols by colorimetric detection assay, and the immobilization was characterized by atomic force microscopy (AFM), scanning tunneling microscopy (STM), and ellipsometer.

Scanning Tunneling Microscopy of Template-Stripped Au Surfaces and Highly Ordered Self-Assembled Monolayers

Langmuir ◽  
2008 ◽  
Vol 24 (12) ◽  
pp. 5984-5987 ◽  
Author(s):  
Sangyeob Lee ◽  
Sung-Soo Bae ◽  
Gilberto Medeiros-Ribeiro ◽  
Jason J. Blackstock ◽  
Sehun Kim ◽  
...  
Keyword(s):  
Scanning Tunneling Microscopy ◽  
Self Assembled Monolayers ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Assembled Monolayers ◽  
Self Assembled
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