Deciphering the Adsorption Mechanisms of RGD Subunits: L-Aspartic Acid on Cu(110)

被引：10
作者：
Totani, Roberta [1 ]
Methivier, Christophe [1 ]
Cruguel, Herve [2 ]
Pradier, Claire-Marie [1 ]
Humblot, Vincent [1 ]
机构：
[1] Univ Paris 06, UPMC, Sorbonne Univ, Lab Reactiv Surface,CNRS,UMR 7197, 4 Pl Jussieu, F-75005 Paris, France
[2] Univ Paris 06, UPMC, Sorbonne Univ, Inst NanoSci Paris CNRS,UMR 7588, 4 Pl Jussieu, F-75005 Paris, France
来源：
JOURNAL OF PHYSICAL CHEMISTRY C | 2017年 / 121卷 / 29期
关键词：
GLY-PRO DIPEPTIDE; AMINO-ACIDS; CU(3,1,17)(R-AND-S) SURFACES; AQUEOUS-SOLUTIONS; MODIFIED NI(111); METAL-SURFACES; GLUTAMIC-ACID; GLYCINE; AU(110); DEPOSITION;
D O I：
10.1021/acs.jpcc.7b04948
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
In this work we present a detailed surface science characterization of L-aspartic acid adsorption on a Cu(110) surface. Aspartic acid is one of the main components of the tripeptide RGD (arginine-glycine-aspartic acid). We replaced the traditional sublimation method to obtain molecular films by dosing aspartic acid directly from an aqueous solution through an electrospray ionization (ESI) device. X-ray photoelectron spectroscopy (XPS) and polarization modulation reflection absorption infrared spectroscopy (PM-RAIRS) evidenced different adsorption states ranging from a submonolayer regime up to multilayers. Molecule-substrate interactions guide the creation of the pattern observed in the submonolayer, but molecule-molecule interactions are prevailing from a certain coverage stage, promoting the overlayer growth while leaving exposed areas of bare copper. This is evidenced by scanning tunneling microscopy (STM) results, showing that single aspartic acid molecules self-organize in a two-dimensional (2D) chiral network at low coverage and start originating new molecular layers even before a saturated monolayer has been reached.
引用
收藏
页码：15842 / 15850
页数：9
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