A.C. (Anne) Berends MSc
A.C.Berends@uu.nl
Gegenereerd op 2017-06-23 14:14:30


Profile

Ultrathin 2-dimensional nanomaterials (nanosheets) have attracted increasing interest over the past decade due to their unique physical, electronic, and structural properties. Well-known examples are graphene and transition metal dichalcogenides. Nanosheets (NSs) are typically obtained by exfoliation of bulk materials or grown on substrates by MBE or CVD. These methods are however not suitable to produce large amounts of free standing NSs and offer little control over their shape and lateral dimensions. Colloidal chemistry offers a promising alternative. Nevertheless, ultrathin (L≤2.5 nm) colloidal NSs have only recently been reported, and are limited to just a few materials. The control over the lateral dimensions and shape is still limited, and the NSs are often entangled, folded, or aggregated. To fully exploit the potential of ultrathin colloidal NSs, improved preparation methods and new materials are needed.

 

We work on the development of new methods to synthesize ultrathin size-and shape controlled colloidal Cu2-xA (A= S,Se) nanosheets. Cation exchange will be subsequently used to convert these nanomaterials into colloidal NSs of a number of other metal chalcogenides (CuInA2, CdA, PbA, MoS2). Colloidal Cu2-xS/ZnS and Cu2-xS/CdS heternonanosheets will also be obtained, by using a multistage seeded hetero-epitaxial growth approach. We also aim to gain a better understanding of the optoelectronic properties of these novel colloidal NSs. The formation mechanism of the Cu2-xA NSs will be investigated in detail by using a combination of optical, vibrational, and 119Sn NMR spectroscopies, and structural characterization techniques (XRD, TEM). The nanomaterials obtained will be systematically studied by using a combination of advanced structural characterization (XRD, TEM, HRTEM, EDS, Z-STEM, energy filtered TEM, EELS) and optical spectroscopy (exciton lifetimes, absorption, emission and excitation spectra, PL quantum yields) over a wide temperature range (1.5-500 K). The intra-band relaxation and exciton dynamics will be probed by transient absorption and THz time-domain spectroscopy. Selected samples will be studied at the single particle level both by optical microscopy and scanning tunneling spectroscopy. The plasmonic properties of the ultrathin colloidal Cu2-xA NSs will also be investigated. 

Gegenereerd op 2017-06-23 14:14:30
All publications
  2016 - Scholarly publications
Van Der Stam, Ward, Rabouw, Freddy T., Geuchies, Jaco J., Berends, Anne C., Hinterding, Stijn O M, Geitenbeek, Robin G., Van Der Lit, Joost, Prévost, Sylvain, Petukhov, Andrei V. & De Mello Donega, Celso (13.09.2016). In Situ Probing of Stack-Templated Growth of Ultrathin Cu2-xS Nanosheets. Chemistry of Materials, 28 (17), (pp. 6381-6389) (9 p.).
Rabouw, F.T., Cogan, N.M.B., Berends, Anne, van der Stam, Ward, Vanmaekelbergh, Daniel, Koenderink, A.F., Kraus, T.D. & de Mello-Donega, Celso (2016). Non-blinking single-photon emitters in silica. Scientific Reports, 6.
van der Stam, W., Berends, A.C. & de Mello-Donega, Celso (2016). Prospects of Colloidal Copper Chalcogenide Nanocrystals. ChemPhysChem, 17, (pp. 559-581).
Berends, A.C., Rabouw, F.T., Spoor, Frank, Bladt, Eva, Grozema, Ferdinand, Houtepen, Arjan, Siebbeles, Laurens & de Mello-Donega, C. (23.08.2016). Radiative and Nonradiative Recombination in CuInS2 Nanocrystals and CuInS2-Based Core/Shell Nanocrystals. Journal of Physical Chemistry Letters, 7 (17), (pp. 3503–3509) (7 p.).
  2015 - Scholarly publications
Van Der Stam, Ward, Berends, Anne C., Rabouw, Freddy T., Willhammar, Tom, Ke, Xiaoxing, Meeldijk, Johannes D., Bals, Sara & De Mello Donega, Celso (27.01.2015). Luminescent CuInS2 quantum dots by partial cation exchange in Cu2- xS nanocrystals. Chemistry of Materials, 27 (2), (pp. 621-628) (8 p.).
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Gegenereerd op 2017-06-23 14:14:30
Full name
A.C. Berends MSc Contact details
Leonard S. Ornsteinlaboratorium

Princetonplein 1
Room 169
3584 CC  UTRECHT
The Netherlands


Phone number (direct) +31 30 253 3545
Gegenereerd op 2017-06-23 14:14:30
Last updated 09.02.2017