K Hübner, M Pilo-Pais, F Selbach, T Liedl, P Tinnefeld, F D Stefani, G P Acuna Directing Single-Molecule Emission with DNA Origami-Assembled Optical Antennas Journal Article Nano Letters, 19 (9), pp. 6629-6634, 2019, ISSN: 1530-6984. Abstract | Links @article{,
title = {Directing Single-Molecule Emission with DNA Origami-Assembled Optical Antennas},
author = {K H\"{u}bner and M Pilo-Pais and F Selbach and T Liedl and P Tinnefeld and F D Stefani and G P Acuna},
url = {https://doi.org/10.1021/acs.nanolett.9b02886},
doi = {10.1021/acs.nanolett.9b02886},
issn = {1530-6984},
year = {2019},
date = {2019-09-11},
journal = {Nano Letters},
volume = {19},
number = {9},
pages = {6629-6634},
abstract = {Abstract Conventional surface enhanced Raman scattering (SERS) substrates are well known for their supreme electromagnetic enhancements and ultrahigh sensitivity in detecting molecules at low concentrations. However, large-area quasi-uniform SERS substrates are difficult to achieve by standard top-down nanofabrication techniques, resulting in fluctuant SERS responses and unwanted fluorescence interferences, which severely limit their performances in practical applications. To tackle these challenges, a large-scale quasi-uniform hybrid graphene fragmented-gold substrate with stable and reproducible SERS readouts as well as large enhancement factors over an ultrawideband spectrum is developed. The hybrid substrate is fabricated via cold-etching through a controllable break up of a thin gold film followed by a graphene transfer. The stimulated localized surface plasmons interact strongly with the graphene layer, leading to spectrally and spatially modified graphene-mediated surface enhanced Raman scattering (GSERS) responses. The perfect monolayer graphene of the GSERS substrate prevents adsorbates from the atmosphere and direct contact between bonded molecules and gold, thus reducing the catalytic activity of gold and producing clean, stable, and reproducible molecular Raman signals. The easy-fabricated hybrid GSERS substrate not only provides a powerful platform to collect robust molecular Raman spectra but also shows great potentials for future mass production of high-performance nanophotonic devices.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Abstract Conventional surface enhanced Raman scattering (SERS) substrates are well known for their supreme electromagnetic enhancements and ultrahigh sensitivity in detecting molecules at low concentrations. However, large-area quasi-uniform SERS substrates are difficult to achieve by standard top-down nanofabrication techniques, resulting in fluctuant SERS responses and unwanted fluorescence interferences, which severely limit their performances in practical applications. To tackle these challenges, a large-scale quasi-uniform hybrid graphene fragmented-gold substrate with stable and reproducible SERS readouts as well as large enhancement factors over an ultrawideband spectrum is developed. The hybrid substrate is fabricated via cold-etching through a controllable break up of a thin gold film followed by a graphene transfer. The stimulated localized surface plasmons interact strongly with the graphene layer, leading to spectrally and spatially modified graphene-mediated surface enhanced Raman scattering (GSERS) responses. The perfect monolayer graphene of the GSERS substrate prevents adsorbates from the atmosphere and direct contact between bonded molecules and gold, thus reducing the catalytic activity of gold and producing clean, stable, and reproducible molecular Raman signals. The easy-fabricated hybrid GSERS substrate not only provides a powerful platform to collect robust molecular Raman spectra but also shows great potentials for future mass production of high-performance nanophotonic devices. |
G Grinblat, I Abdelwahab, M P Nielsen, P Dichtl, K Leng, R F Oulton, K P Loh, S A Maier Ultrafast All-Optical Modulation in 2D Hybrid Perovskites Journal Article ACS Nano, 13 (8), pp. 9504-9510, 2019, ISSN: 1936-0851. Links @article{,
title = {Ultrafast All-Optical Modulation in 2D Hybrid Perovskites},
author = {G Grinblat and I Abdelwahab and M P Nielsen and P Dichtl and K Leng and R F Oulton and K P Loh and S A Maier},
url = {https://doi.org/10.1021/acsnano.9b04483},
doi = {10.1021/acsnano.9b04483},
issn = {1936-0851},
year = {2019},
date = {2019-08-27},
journal = {ACS Nano},
volume = {13},
number = {8},
pages = {9504-9510},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
L Polavarapu, H Huang, Y Li, Y Tong, E-P Yao, M Döblinger, M W Feil, A F Richter, A L Rogach, J Feldmann Spontaneous Crystallization of Perovskite Nanocrystals in Nonpolar Organic Solvents: A Versatile Approach for their Shape-controlled Synthesis Journal Article Angewandte Chemie International Edition, 0 (ja), 2019, ISSN: 1433-7851. Abstract | Links @article{,
title = {Spontaneous Crystallization of Perovskite Nanocrystals in Nonpolar Organic Solvents: A Versatile Approach for their Shape-controlled Synthesis},
author = {L Polavarapu and H Huang and Y Li and Y Tong and E-P Yao and M D\"{o}blinger and M W Feil and A F Richter and A L Rogach and J Feldmann},
url = {https://doi.org/10.1002/anie.201906862},
doi = {10.1002/anie.201906862},
issn = {1433-7851},
year = {2019},
date = {2019-08-21},
journal = {Angewandte Chemie International Edition},
volume = {0},
number = {ja},
abstract = {The growing demand of perovskite nanocrystals (NCs) for various applications has stimulated great research interest in the development of facile synthetic methods. They have often been synthesized by either ligand assisted reprecipitation (LARP) at room temperature or by hot-injection at high temperatures and inert atmosphere. However, the use of polar solvents in LARP effects their stability. Herein, we report on the spontaneous crystallization of perovskite nanocrystals in nonpolar organic media at ambient conditions by simple mixing of precursor-ligand complexes without applying any external stimuli. The shape of the NCs can be controlled from nanocubes to nanoplatelets by varying the ratio of monovalent (e.g. formamidinium+ (FA+) and Cs+) to divalent (Pb2+) cation-ligand complexes. The precursor-ligand complexes are stable for months, and thus perovskite NCs can be readily prepared prior to use. Moreover, we show that this versatile synthetic process is scalable and can be generally applicable for perovskite NCs of different compositions.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The growing demand of perovskite nanocrystals (NCs) for various applications has stimulated great research interest in the development of facile synthetic methods. They have often been synthesized by either ligand assisted reprecipitation (LARP) at room temperature or by hot-injection at high temperatures and inert atmosphere. However, the use of polar solvents in LARP effects their stability. Herein, we report on the spontaneous crystallization of perovskite nanocrystals in nonpolar organic media at ambient conditions by simple mixing of precursor-ligand complexes without applying any external stimuli. The shape of the NCs can be controlled from nanocubes to nanoplatelets by varying the ratio of monovalent (e.g. formamidinium+ (FA+) and Cs+) to divalent (Pb2+) cation-ligand complexes. The precursor-ligand complexes are stable for months, and thus perovskite NCs can be readily prepared prior to use. Moreover, we show that this versatile synthetic process is scalable and can be generally applicable for perovskite NCs of different compositions. |
