TY  - JOUR
A1  - Zeng, Ting
A1  - Frasca, Stefano
A1  - Rumschöttel, Jens
A1  - Koetz, Joachim
A1  - Leimkühler, Silke
A1  - Wollenberger, Ursula
T1  - Role of Conductive Nanoparticles in the Direct Unmediated Bioelectrocatalysis of Immobilized Sulfite Oxidase
JF  - Electroanalysis : an international journal devoted to fundamental and practical aspects of electroanalysis
KW  - Direct electron transfer
KW  - Protein voltammetry
KW  - Human sulfite oxidase
KW  - Bioelectrocatalysis
KW  - Nanoparticles
Y1  - 2016
U6  - https://doi.org/10.1002/elan.201600246
SN  - 1040-0397
SN  - 1521-4109
VL  - 28
SP  - 2303
EP  - 2310
PB  - Wiley-VCH
CY  - Weinheim
ER  - 
TY  - JOUR
A1  - Meiling, Till Thomas
A1  - Cywiński, Piotr J.
A1  - Bald, Ilko
T1  - White carbon: Fluorescent carbon nanoparticles with tunable quantum yield in a reproducible green synthesis
JF  - Scientific reports
N2  - In this study, a new reliable, economic, and environmentally-friendly one-step synthesis is established to obtain carbon nanodots (CNDs) with well-defined and reproducible photoluminescence (PL) properties via the microwave-assisted hydrothermal treatment of starch and Tris-acetate-EDTA (TAE) buffer as carbon sources. Three kinds of CNDs are prepared using different sets of above mentioned starting materials. The as-synthesized CNDs: C-CND (starch only), N-CND 1 (starch in TAE) and N-CND 2 (TAE only) exhibit highly homogenous PL and are ready to use without need for further purification. The CNDs are stable over a long period of time (>1 year) either in solution or as freeze-dried powder. Depending on starting material, CNDs with PL quantum yield (PLQY) ranging from less than 1% up to 28% are obtained. The influence of the precursor concentration, reaction time and type of additives on the optical properties (UV-Vis absorption, PL emission spectrum and PLQY) is carefully investigated, providing insight into the chemical processes that occur during CND formation. Remarkably, upon freeze-drying the initially brown CND-solution turns into a non-fluorescent white/slightly brown powder which recovers PL in aqueous solution and can potentially be applied as fluorescent marker in bio-imaging, as a reduction agent or as a photocatalyst.
KW  - Fluorescence spectroscopy
KW  - Nanoparticles
KW  - Synthesis and processing
Y1  - 2016
U6  - https://doi.org/10.1038/srep28557
VL  - 6
PB  - Nature Publishing Group
CY  - London
ER  -