Guided selective deposition of nanoparticles by tuning of the surface potential
Artikel i vetenskaplig tidskrift, 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

behavior

Physics

temperature

oxidation

atomic-force microscopy

interface

transport

Författare

Johnas Eklöf

Kemi och kemiteknik, Tillämpad kemi, Polymerteknologi

Alicja Stolas

Kemi och kemiteknik, Tillämpad kemi, Polymerteknologi

M. Herzberg

Anna Pekkari

Kemi och kemiteknik, Tillämpad kemi, Polymerteknologi

Behabitu Ergette Tebikachew

Kemi och kemiteknik, Tillämpad kemi, Polymerteknologi

Tina Gschneidtner

Kemi och kemiteknik, Tillämpad kemi, Polymerteknologi

Samuel Lara Avila

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

T. Hassenkam

Kasper Moth-Poulsen

Kemi och kemiteknik, Tillämpad kemi, Polymerteknologi

Europhysics Letters

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

Vol. 119 Art no: 18004-

Ämneskategorier

Polymerkemi

DOI

10.1209/0295-5075/119/18004