TY  - GEN
A1  - Xie, Zai-Lai
A1  - Huang, Xing
A1  - Titirici, Maria-Magdalena
A1  - Taubert, Andreas
T1  - Mesoporous graphite nanoflakes via ionothermal carbonization of fructose and their use in dye removal
N2  - The large-scale green synthesis of graphene-type two-dimensional materials is still challenging. Herein, we describe the ionothermal synthesis of carbon-based composites from fructose in the iron-containing ionic liquid 1-butyl-3-methylimidazolium tetrachloridoferrate(III), [Bmim][FeCl4] serving as solvent, catalyst, and template for product formation. The resulting composites consist of oligo-layer graphite nanoflakes and iron carbide particles. The mesoporosity, strong magnetic moment, and high specific surface area of the composites make them attractive for water purification with facile magnetic separation. Moreover, Fe3Cfree graphite can be obtained via acid etching, providing access to fairly large amounts of graphite material. The current approach is versatile and scalable, and thus opens the door to ionothermal synthesis towards the larger-scale synthesis of materials that are, although not made via a sustainable process, useful for water treatment such as the removal of organic molecules.
T3  - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - 283 
Y1  - 2014
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-99427
ER  - 
TY  - GEN
A1  - Zamponi, Flavio
A1  - Penfold, Thomas J.
A1  - Nachtegaal, Maarten
A1  - Lübcke, Andrea
A1  - Rittmann, Jochen
A1  - Milne, Chris J.
A1  - Chergui, Majed
A1  - van Bokhoven, Jeroen A.
T1  - Probing the dynamics of plasmon-excited hexanethiol-capped gold nanoparticles by picosecond X-ray absorption spectroscopy
N2  - Picosecond X-ray absorption spectroscopy (XAS) is used to investigate the electronic and structural dynamics initiated by plasmon excitation of 1.8 nm diameter Au nanoparticles (NPs) functionalised with 1-hexanethiol. We show that 100 ps after photoexcitation the transient XAS spectrum is consistent with an 8% expansion of the Au–Au bond length and a large increase in disorder associated with melting of the NPs. Recovery of the ground state occurs with a time constant of ∼1.8 ns, arising from thermalisation with the environment. Simulations reveal that the transient spectrum exhibits no signature of charge separation at 100 ps and allows us to estimate an upper limit for the quantum yield (QY) of this process to be <0.1.
T3  - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - paper 176 
KW  - TiO2 nanoparticles
KW  - diimine-complexes
KW  - electron-transfer
KW  - excitation
KW  - nanoclusters
KW  - reactivity
KW  - supported gold
KW  - surface
KW  - visible-light
KW  - water
Y1  - 2014
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-74492
SP  - 23157
EP  - 23163
ER  -