Guided selective deposition of nanoparticles by tuning of the surface potential
Journal article, 2017

Guided deposition of nanoparticles onto different substrates is of great importance for a variety of applications such as biosensing, targeted cancer therapy, anti-bacterial coatings and single molecular electronics. It is therefore important to gain an understanding of what parameters are involved in the deposition of nanoparticles. In this work we have deposited 60 nm, negatively charged, citrate stabilized gold nanoparticles onto microstructures consisting of six different materials, (vanadium (V), silicon dioxide (SiO2), gold (Au), aluminum (Al), copper (Cu) and nickel (Ni)). The samples have then been investigated by scanning electron microscopy to extract the particle density. The surface potential was calculated from the measured surface charge density maps measured by atomic force microscopy while the samples were submerged in a KCl water solution. These values were compared with literature values of the isoelectric points (IEP) of different oxides formed on the metals in an ambient environment. According to measurements, Al had the highest surface potential followed by Ni and Cu. The same trend was observed for the nanoparticle densities. No particles were found on V, SiO2 and Au. The literature values of the IEP showed a different trend compared to the surface potential measurements concluding that IEP is not a reliable parameter for the prediction of NP deposition. focus article Copyright (C) EPLA, 2017

atomic-force microscopy

Physics

interface

transport

temperature

oxidation

behavior

Author

Johnas Eklöf

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Polymer Technology

Alicja Stolas

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Polymer Technology

M. Herzberg

Anna Pekkari

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Polymer Technology

Behabitu Ergette Tebikachew

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Polymer Technology

Tina Gschneidtner

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Polymer Technology

Samuel Lara Avila

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

T. Hassenkam

Kasper Moth-Poulsen

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Polymer Technology

Europhysics Letters

0295-5075 (ISSN) 1286-4854 (eISSN)

Vol. 119 1 Art no: 18004-

Subject Categories

Polymer Chemistry

DOI

10.1209/0295-5075/119/18004

More information

Latest update

5/17/2018