@article{CuiShenYanetal.2014,
  author    = {Cui, Qianling and Shen, Guizhi and Yan, Xuehai and Li, Lidong and Moehwald, Helmuth and Bargheer, Matias},
  title     = {Fabrication of Au@Pt multibranched nanoparticles and their application to in situ SERS monitoring},
  series = {ACS applied materials \& interfaces},
  volume    = {6},
  journal   = {ACS applied materials \& interfaces},
  number    = {19},
  publisher = {American Chemical Society},
  address   = {Washington},
  issn      = {1944-8244},
  doi       = {10.1021/am504709a},
  pages     = {17075 -- 17081},
  year      = {2014},
  abstract  = {Here, we present an Au@Pt core-shell multibranched nanoparticle as a new substrate capable of in situ surface-enhanced Raman scattering (SERS), thereby enabling monitoring of the catalytic reaction on the active surface. By careful control of the amount of Pt deposited bimetallic Au@Pt, nanoparticles with moderate performance both for SERS and catalytic activity were obtained. The Pt-catalyzed reduction of 4-nitrothiophenol by borohydride was chosen as the model reaction. The intermediate during the reaction was captured and clearly identified via SERS spectroscopy. We established in situ SERS spectroscopy as a promising and powerful technique to investigate in situ reactions taking place in heterogeneous catalysis.},
  language  = {en}
}
@article{CuiYashchenokLietal.2015,
  author    = {Cui, Qianling and Yashchenok, Alexey and Li, Lidong and Moehwald, Helmuth and Bargheer, Matias},
  title     = {Mechanistic study on reduction reaction of nitro compounds catalyzed by gold nanoparticles using in situ SERS monitoring},
  series = {Colloids and surfaces : an international journal devoted to the principles and applications of colloid and interface science ; A, Physicochemical and engineering aspects},
  volume    = {470},
  journal   = {Colloids and surfaces : an international journal devoted to the principles and applications of colloid and interface science ; A, Physicochemical and engineering aspects},
  publisher = {Elsevier},
  address   = {Amsterdam},
  issn      = {0927-7757},
  doi       = {10.1016/j.colsurfa.2015.01.075},
  pages     = {108 -- 113},
  year      = {2015},
  abstract  = {Surface-enhanced Raman scattering (SERS) spectroscopy has emerged in recent years as a promising and powerful technique to investigate the reaction mechanism of heterogeneous catalysis. In this work, the reduction reaction of 4-nitrothiophenol (4-NTP) to its corresponding amino derivate catalyzed by gold took place between the gold nanoshell and gold nanostar. Due to the strong binding of thiol group to the gold surface, the molecular configuration of 4-NTP was fixed with NO2 group towards outside. The direct contact of NO2 group with catalytic gold nanostars ensured the reduction reaction went smoothly, which was monitored by SERS spectroscopy. The NO2 vibration Raman band showed a unique blue-shift without any appearance of dimerization product, indicating this catalytic reaction might follow a monomolecular mechanistic pathway. (C) 2015 Elsevier B.V. All rights reserved.},
  language  = {en}
}
@article{CuiYashchenokZhangetal.2014,
  author    = {Cui, Qianling and Yashchenok, Alexey and Zhang, Lu and Li, Lidong and Masic, Admir and Wienskol, Gabriele and Moehwald, Helmuth and Bargheer, Matias},
  title     = {Fabrication of Bifunctional Gold/Gelatin Hybrid Nanocomposites and Their Application},
  series = {ACS applied materials \& interfaces},
  volume    = {6},
  journal   = {ACS applied materials \& interfaces},
  number    = {3},
  publisher = {American Chemical Society},
  address   = {Washington},
  issn      = {1944-8244},
  doi       = {10.1021/am5000068},
  pages     = {1999 -- 2002},
  year      = {2014},
  abstract  = {Herein, a facile method is presented to integrate large gold nanoflowers (similar to 80 nm) and small gold nanoparticles (2-4 nm) into a single entity, exhibiting both surface-enhanced Raman scattering (SERS) and catalytic activity. The as-prepared gold nanoflowers were coated by a gelatin layer, in which the gold precursor was adsorbed and in situ reduced into small gold nanoparticles. The thickness of the gelatin shell is controlled to less than 10 nm, ensuring that the small gold nanoparticles are still in a SERS-active range of the inner Au core. Therefore, the reaction catalyzed by these nanocomposites can be monitored in situ using label-free SERS spectroscopy. In addition, these bifunctional nanocomposites are also attractive candidates for application in SERS monitoring of bioreactions because of their excellent biocompatibility.},
  language  = {en}
}
@misc{MitzscherlingCuiKoopmanetal.2015,
  author    = {Mitzscherling, Steffen and Cui, Qianling and Koopman, Wouter-Willem Adriaan and Bargheer, Matias},
  title     = {Dielectric function of two-phase colloid-polymer nanocomposite},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-102695},
  pages     = {29465 -- 29474},
  year      = {2015},
  abstract  = {The plasmon resonance of metal nanoparticles determines their optical response in the visible spectral range. Many details such as the electronic properties of gold near the particle surface and the local environment of the particles influence the spectra. We show how the cheap but highly precise fabrication of composite nanolayers by spin-assisted layer-by-layer deposition of polyelectrolytes can be used to investigate the spectral response of gold nanospheres (GNS) and gold nanorods (GNR) in a self-consistent way, using the established Maxwell-Garnett effective medium (MGEM) theory beyond the limit of homogeneous media. We show that the dielectric function of gold nanoparticles differs from the bulk value and experimentally characterize the shape and the surrounding of the particles thoroughly by SEM, AFM and ellipsometry. Averaging the dielectric functions of the layered surrounding by an appropriate weighting with the electric field intensity yields excellent agreement for the spectra of several nanoparticles and nanorods with various cover-layer thicknesses.},
  language  = {en}
}