TY  - JOUR
A1  - Mennicken, Max
A1  - Peter, Sophia Katharina
A1  - Kaulen, Corinna
A1  - Simon, Ulrich
A1  - Karthäuser, Silvia
T1  - Controlling the Electronic Contact at the Terpyridine/Metal Interface
JF  - The Journal of Physical Chemistry C
Y1  - 2019
U6  - http://dx.doi.org/10.1021/acs.jpcc.9b05865
SN  - 1932-7455
VL  - 123
IS  - 35
SP  - 21367
EP  - 21375
ER  - 
TY  - JOUR
A1  - Mennicken, Max
A1  - Peter, Sophia K.
A1  - Kaulen, Corinna
A1  - Simon, Ulrich
A1  - Karthäuser, Silvia
T1  - Transport through Redox-Active Ru-Terpyridine Complexes Integrated in Single Nanoparticle Devices
JF  - The Journal of Physical Chemistry C
N2  - Transition metal complexes are electrofunctional molecules due to their high conductivity and their intrinsic switching ability involving a metal-to-ligand charge transfer. Here, a method is presented to contact reliably a few to single redox-active Ru-terpyridine complexes in a CMOS compatible nanodevice and preserve their electrical functionality. Using hybrid materials from 14 nm gold nanoparticles (AuNP) and bis-{4′-[4-(mercaptophenyl)-2,2′:6′,2″-terpyridine]}-ruthenium(II) complexes a device size of 30² nm² inclusive nanoelectrodes is achieved. Moreover, this method bears the opportunity for further downscaling. The Ru-complex AuNP devices show symmetric and asymmetric current versus voltage curves with a hysteretic characteristic in two well separated conductance ranges. By theoretical approximations based on the single-channel Landauer model, the charge transport through the formed double-barrier tunnel junction is thoroughly analyzed and its sensibility to the molecule/metal contact is revealed. It can be verified that tunneling transport through the HOMO is the main transport mechanism while decoherent hopping transport is present to a minor extent.
Y1  - 2020
U6  - http://dx.doi.org/10.1021/acs.jpcc.9b11716
SN  - 1932-7455
VL  - 124
IS  - 8
SP  - 4881
EP  - 4889
PB  - ACS Publications
CY  - Washington, DC
ER  - 
TY  - JOUR
A1  - Karschuck, Tobias
A1  - Kaulen, Corinna
A1  - Poghossian, Arshak
A1  - Wagner, Patrick H.
A1  - Schöning, Michael Josef
T1  - Gold nanoparticle-modified capacitive field-effect sensors: Studying the surface density of nanoparticles and coupling of charged polyelectrolyte macromolecules
JF  - Electrochemical Science Advances
N2  - The coupling of ligand-stabilized gold nanoparticles with field-effect devices offers new possibilities for label-free biosensing. In this work, we study the immobilization of aminooctanethiol-stabilized gold nanoparticles (AuAOTs) on the silicon dioxide surface of a capacitive field-effect sensor. The terminal amino group of the AuAOT is well suited for the functionalization with biomolecules. The attachment of the positively-charged AuAOTs on a capacitive field-effect sensor was detected by direct electrical readout using capacitance-voltage and constant capacitance measurements. With a higher particle density on the sensor surface, the measured signal change was correspondingly more pronounced. The results demonstrate the ability of capacitive field-effect sensors for the non-destructive quantitative validation of nanoparticle immobilization. In addition, the electrostatic binding of the polyanion polystyrene sulfonate to the AuAOT-modified sensor surface was studied as a model system for the label-free detection of charged macromolecules. Most likely, this approach can be transferred to the label-free detection of other charged molecules such as enzymes or antibodies.
KW  - polystyrene sulfonate
KW  - gold nanoparticles
KW  - field-effect sensor
KW  - detection of charged macromolecules
KW  - capacitive EIS sensor
Y1  - 2021
U6  - http://dx.doi.org/10.1002/elsa.202100179
SN  - 0938-5193
VL  - 2
IS  - 5
PB  - Wiley-VCH
CY  - Weinheim
ER  -