Porosity Effects on the Ordering and Stability of Self-Assembled Monolayers on Nanoporous Gold

2020 ◽  
Vol 124 (49) ◽  
pp. 26851-26863
Author(s):  
Dipna A. Patel ◽  
Robert B. Chevalier ◽  
Andrew M. Weller ◽  
Christopher C. Shakespeare ◽  
Edward J. Soares ◽  
...  
Keyword(s):  
Nanoporous Gold ◽  
Self Assembled Monolayers ◽  
Assembled Monolayers ◽  
Self Assembled

scholarly journals Adsorption and desorption of self-assembled L-cysteine monolayers on nanoporous gold monitored by in situ resistometry

2019 ◽  
Vol 10 ◽  
pp. 2275-2279
Author(s):  
Elisabeth Hengge ◽  
Eva-Maria Steyskal ◽  
Rupert Bachler ◽  
Alexander Dennig ◽  
Bernd Nidetzky ◽  
...  
Keyword(s):  
Gold Surface ◽  
Research Field ◽  
Nanoporous Gold ◽  
Self Assembled Monolayers ◽  
Initial Surface ◽  
Resistance Change ◽  
Adsorption And Desorption ◽  
Assembled Monolayers ◽  
Self Assembled

Surface modifications of nanoporous metals have become a highly attractive research field as they exhibit great potential for various applications, especially in biotechnology. Using self-assembled monolayers is one of the most promising approaches to modify a gold surface. However, only few techniques are capable of characterizing the formation of these monolayers on porous substrates. Here, we present a method to in situ monitor the adsorption and desorption of self-assembled monolayers on nanoporous gold by resistometry, using cysteine as example. During the adsorption an overall relative change in resistance of 18% is detected, which occurs in three distinct stages. First, the cysteine molecules are adsorbed on the outer surface. In the second stage, they are adsorbed on the internal surfaces and in the last stage the reordering accompanied by additional adsorption takes place. The successful binding of cysteine on the Au surface was confirmed by cyclic voltammetry, which showed a significant decrease of the double-layer capacitance. Also, the electrochemically controlled desorption of cysteine was monitored by concomitant in situ resistometry. From the desorption peak related to the (111) surface of the structure, which is associated with a resistance change of 4.8%, an initial surface coverage of 0.48 monolayers of cysteine could be estimated.

Ordering and defects in self-assembled monolayers on nanoporous gold

2016 ◽  
Vol 387 ◽  
pp. 503-512 ◽  
Author(s):  
Dipna A. Patel ◽  
Andrew M. Weller ◽  
Robert B. Chevalier ◽  
Constantine A. Karos ◽  
Elizabeth C. Landis
Keyword(s):  
Nanoporous Gold ◽  
Self Assembled Monolayers ◽  
Assembled Monolayers ◽  
Self Assembled

Tailoring the Strength of Nanoporous Gold by Self-Assembled Monolayers of Alkanethiols

2018 ◽  
Vol 1 (12) ◽  
pp. 6613-6621 ◽  
Author(s):  
Nadiia Mameka ◽  
Lukas Lührs ◽  
Stefan Heissler ◽  
Hartmut Gliemann ◽  
Christof Wöll
Keyword(s):  
Nanoporous Gold ◽  
Self Assembled Monolayers ◽  
Assembled Monolayers ◽  
Self Assembled

scholarly journals Electrochemical characterization of globotriose-containing self-assembled monolayers on nanoporous gold and their binding of soybean agglutinin

2013 ◽  
Vol 373 ◽  
pp. 9-17 ◽  
Author(s):  
Binod Pandey ◽  
Yih Horng Tan ◽  
Archana R. Parameswar ◽  
Papapida Pornsuriyasak ◽  
Alexei V. Demchenko ◽  
...  
Keyword(s):  
Electrochemical Characterization ◽  
Nanoporous Gold ◽  
Self Assembled Monolayers ◽  
Soybean Agglutinin ◽  
Assembled Monolayers ◽  
Self Assembled

scholarly journals Nanoporous gold electrodes modified with self-assembled monolayers for electrochemical control of the surface charge

2021 ◽  
Author(s):  
Elisabeth Hengge ◽  
Markus Hirber ◽  
Philipp Brunner ◽  
Eva-Maria Steyskal ◽  
Bernd Nidetzky ◽  
...  
Keyword(s):  
Surface Charge ◽  
Nanoporous Gold ◽  
Point Of Zero Charge ◽  
Self Assembled Monolayers ◽  
Charge Control ◽  
Assembled Monolayers ◽  
Deprotonation Reaction ◽  
Electrochemical Control ◽  
Self Assembled ◽  
Long Chain

Nanoporous gold is modified with self-assembled monolayers (SAMs) of different length. The point of zero charge and the protonation/deprotonation reaction are investigated revealing precise charge control for long-chain SAMs.

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