TY  - JOUR
A1  - Schürmann, Robin
A1  - Titov, Evgenii
A1  - Ebel, Kenny
A1  - Kogikoski Junior, Sergio
A1  - Mostafa, Amr
A1  - Saalfrank, Peter
A1  - Milosavljević, Aleksandar R.
A1  - Bald, Ilko
T1  - The electronic structure of the metal-organic interface of isolated ligand coated gold nanoparticles
JF  - Nanoscale Advances
N2  - Light induced electron transfer reactions of molecules on the surface of noble metal nanoparticles (NPs) depend significantly on the electronic properties of the metal-organic interface. Hybridized metal-molecule states and dipoles at the interface alter the work function and facilitate or hinder electron transfer between the NPs and ligand. X-ray photoelectron spectroscopy (XPS) measurements of isolated AuNPs coated with thiolated ligands in a vacuum have been performed as a function of photon energy, and the depth dependent information of the metal-organic interface has been obtained. The role of surface dipoles in the XPS measurements of isolated ligand coated NPs is discussed and the binding energy of the Au 4f states is shifted by around 0.8 eV in the outer atomic layers of 4-nitrothiophenol coated AuNPs, facilitating electron transport towards the molecules. Moreover, the influence of the interface dipole depends significantly on the adsorbed ligand molecules. The present study paves the way towards the engineering of the electronic properties of the nanoparticle surface, which is of utmost importance for the application of plasmonic nanoparticles in the fields of heterogeneous catalysis and solar energy conversion.
Y1  - 2022
U6  - https://doi.org/10.1039/d1na00737h
SN  - 2516-0230
VL  - 4
IS  - 6
SP  - 1599
EP  - 1607
PB  - Royal Society of Chemistry
CY  - Cambridge
ER  - 
TY  - JOUR
A1  - Schneider, Matthias
A1  - Fritzsche, Nora
A1  - Puciul-Malinowska, Agnieszka
A1  - Baliś, Andrzej
A1  - Mostafa, Amr
A1  - Bald, Ilko
A1  - Zapotoczny, Szczepan
A1  - Taubert, Andreas
T1  - Surface etching of 3D printed poly(lactic acid) with NaOH
BT  - a systematic approach
JF  - Polymers
N2  - The article describes a systematic investigation of the effects of an aqueous NaOH treatment of 3D printed poly(lactic acid) (PLA) scaffolds for surface activation. The PLA surface undergoes several morphology changes and after an initial surface roughening, the surface becomes smoother again before the material dissolves. Erosion rates and surface morphologies can be controlled by the treatment. At the same time, the bulk mechanical properties of the treated materials remain unaltered. This indicates that NaOH treatment of 3D printed PLA scaffolds is a simple, yet viable strategy for surface activation without compromising the mechanical stability of PLA scaffolds.
KW  - surface modification
KW  - sodium hydroxide etching
KW  - poly(lactic acid)
KW  - 3D
KW  - printing
KW  - roughness
KW  - wettability
KW  - erosion
Y1  - 2020
U6  - https://doi.org/10.3390/polym12081711
SN  - 2073-4360
VL  - 12
IS  - 8
PB  - MDPI
CY  - Basel
ER  - 
TY  - JOUR
A1  - Schneider, Matthias
A1  - Fritzsche, Nora
A1  - Puciul-Malinowska, Agnieszka
A1  - Balis, Andrzej
A1  - Mostafa, Amr
A1  - Bald, Ilko
A1  - Zapotoczny, Szczepan
A1  - Taubert, Andreas
T1  - Surface etching of 3D printed poly(lactic acid) with NaOH: a systematic approach
JF  - Polymers
N2  - The article describes a systematic investigation of the effects of an aqueous NaOH treatment of 3D printed poly(lactic acid) (PLA) scaffolds for surface activation. The PLA surface undergoes several morphology changes and after an initial surface roughening, the surface becomes smoother again before the material dissolves. Erosion rates and surface morphologies can be controlled by the treatment. At the same time, the bulk mechanical properties of the treated materials remain unaltered. This indicates that NaOH treatment of 3D printed PLA scaffolds is a simple, yet viable strategy for surface activation without compromising the mechanical stability of PLA scaffolds.
KW  - surface modification
KW  - sodium hydroxide etching
KW  - poly(lactic acid)
KW  - 3D printing
KW  - roughness
KW  - wettability
KW  - erosion
Y1  - 2020
VL  - 12
IS  - 8
PB  - MDPI
CY  - Basel
ER  -