TY  - JOUR
AU  - Greben, Kyrylo
AU  - Li, Pinggui
AU  - Mayer, Dirk
AU  - Offenhäusser, Andreas
AU  - Wördenweber, Roger
TI  - Immobilization and Surface Functionalization of Gold Nanoparticles Monitored via Streaming Current/Potential Measurements
JO  - The journal of physical chemistry  / B
VL  - 119
IS  - 19
SN  - 1520-5207
CY  - Washington, DC
PB  - Soc.
M1  - FZJ-2015-05418
SP  - 5988 - 5994
PY  - 2015
AB  - A streaming current/potential method is optimized and used for the analysis of the variation of the surface potential upon chemical modifications of a complex interface consisting of different organic molecules and gold nanoparticles (AuNPs). The surfaces of Si/SiO2 substrates modified with 3-aminopropyltriethoxysilane (APTES), AuNPs, and 11-amino-1-undecanethiol (aminothiols) are analyzed via pH and time dependent zeta potential measurements that reveal the stability and modification of the surface and identify crucial parameters for each individual preparation step. For instance, surface activation and especially molecular adsorbate layers tend not to be stable in time, whereas the substrate and the AuNPs provide a stable surface potential as long as impurities are avoided. It is shown that the streaming potential/current technique represents an ideal tool to analyze and monitor the complex surfaces and their modification.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000354911300006
DO  - DOI:10.1021/acs.jpcb.5b02615
UR  - https://juser.fz-juelich.de/record/203497
ER  -