Article
Materials Science, Multidisciplinary
Muchuan Hua, Ricardo S. Decca
Summary: This study investigated the possibility of optical refrigeration on zinc-blende CdSe/CdS core/shell structure quantum dots and developed a semiempirical model to predict the feasibility of optical refrigeration on a CdSe QD system.
Article
Chemistry, Physical
Shuman Jia, Changsheng Song, Meng Xu, Bing Bai, Jiajia Liu, Hongpan Rong, Jiatao Zhang
Summary: This study investigates doping-related point defect engineering in low-dimensional semiconductor nanostructures, focusing on the control of copper doping sites by carefully managing the kinetics of reverse cation exchange. Substitutional and interstitial copper dopants were directly confirmed, showing dramatic differences in conductivities and luminescence performance. This research provides deeper insights into the regulation of dopant locations in nanostructured host semiconductors.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Can Lu, Andreas Drichel, Jianhong Chen, Florian Enders, Anna Rokicinska, Piotr Kustrowski, Richard Dronskowski, Klaus Boldt, Adam Slabon
Summary: This study investigated the performance of core/shell quantum dots paired with semiconductor photocathodes for water reduction, finding that the integration of quantum dots with NiO photocathodes can significantly enhance water reduction efficiency, with both different structure quantum dots showing similar effects in generating photocurrent enhancement. Exploring the carrier kinetics at the interface of these hybrid photocathodes is critical for the development of efficient PEC proton reduction.
Article
Chemistry, Multidisciplinary
Nianfang Wang, Seokhyeon Cheong, Da-Eun Yoon, Pan Lu, Hyunjoo Lee, Young Kuk Lee, Young-Shin Park, Doh C. Lee
Summary: Advances in nanotechnology have enabled precise design of catalytic sites for CO2 photoreduction, but most nanostructured photocatalysts have low activity. To address this issue, researchers constructed CdS nanosheets terminated by S2- atomic layers as intrinsic photocatalysts. Experimental results show that these nanostructures exhibit excellent photocatalytic performance, efficiently converting CO2 into CO with high selectivity.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Physical
Jayanta Ghosh, Mirali Gheibi, Tillmann Kalas, Cristian Sarpe, Bastian Zielinski, Ramela Ciobotea, Christoph Burghard Morscher, Ingo Koehne, Rudolf Pietschnig, Arne Senftleben, Thomas Baumert, Hendrike Braun
Summary: Temporally delayed, phase-locked coherent pairs of near IR femtosecond laser pulses were used to investigate electronic coherences in molecular Nd3+-complexes at room temperature. Dissolved and solid complexes were studied using a confocal microscope with fluorescence detection. The observed electronic coherence on a few hundred femtoseconds time scale is modulated by additional coherent wave packet dynamics, mainly attributed to vibrations. In the future, these complexes could serve as prototypes for potential applications in quantum information technology.
Article
Chemistry, Multidisciplinary
Jonas K. Widness, Daniel G. Enny, Kaelyn S. McFarlane-Connelly, Mahilet T. Miedenbauer, Todd D. Krauss, Daniel J. Weix
Summary: This paper reports the use of CdS nanocrystal quantum dots as strong photoreductants for efficient photoreductive cleavage of aryl chlorides and phosphate esters. The conditions described in this study also enable other challenging reductions and achieve high turnover numbers. The stability of the CdS quantum dots under these conditions makes them a promising catalyst for various reduction reactions.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Physics, Multidisciplinary
Emma Rosenfeld, Ralf Riedinger, Jan Gieseler, Martin Schuetz, Mikhail D. Lukin
Summary: In the lab, scientists have proposed a scheme that uses a hot mechanical oscillator to entangle distant spin qubits, showing that it is feasible with realistic parameters. They found that high-fidelity entanglement can be achieved at low and ambient temperatures, opening up new possibilities for quantum processing of solid-state spin qubits.
PHYSICAL REVIEW LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Jieun Kim, Jung Wook Lim, Han Seul Kim
Summary: Attention in the human brain enhances effective encoding and storage of information, similar to the role of gate voltage in synaptic devices. TiO2-based synaptic devices replicate brain functions, from vision processing to memory retention. Different electrical properties induced by photo and electric stimuli simulate human vision and memory retention capabilities.
MATERIALS TODAY ADVANCES
(2023)
Article
Materials Science, Multidisciplinary
Shao Yan, Yanjie Liang, Jingwei Liu, Dongxun Chen, Shihai Miao, Jianqiang Bi, Kangning Sun
Summary: The study reports the design and development of a series of Pr3+-doped garnet-based UVB persistent phosphors, which can be charged using a 254 nm UV lamp or natural sunlight to generate a lasting UVB afterglow of over 60 hours. The luminescence mechanism of these garnet materials is comprehensively investigated through persistent luminescence excitation spectra and thermoluminescence experiments, showing important potential for applications in bright environments.
JOURNAL OF MATERIALS CHEMISTRY C
(2021)
Article
Chemistry, Physical
Carolyn L. Hartley, Jillian L. Dempsey
Summary: This study investigates defects on the surfaces of semiconductor quantum dots using redoxactive chemical probes and spectroscopic tools, revealing the impact of different sizes and reductant strengths on ligand displacement, as well as the conclusion that large quantum dots have more native disulfide defects.
CHEMISTRY OF MATERIALS
(2021)
Article
Chemistry, Physical
Hemen Gogoi, Sushil Swaroop Pathak, Souradip Dasgupta, Leela Srinivas Panchakarla, Sukhendu Nath, Anindya Datta
Summary: CdS quantum dots synthesized by a sol-gel method exhibit significantly Stokes shifted bright photoluminescence, predominantly from the trap states. The photoluminescence decay at the emission maximum is single-exponential, indicating a narrow distribution in the nature of trap states. An additional fast decay component is observed at shorter emission wavelengths, possibly due to band edge emission, which remains elusive in the steady-state spectra. Transient absorption spectra reveal the exciton dynamics in the quantum dots, with stimulated emission observed even at low pump power.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Physical
Ho Jin, Clement Livache, Whi Dong Kim, Benjamin T. Diroll, Richard D. Schaller, Victor I. Klimov
Summary: The authors achieve a threefold enhancement in multiexciton yields in Mn-doped PbSe/CdSe quantum dots by exploiting spin-exchange interactions. These interactions outpace phonon emission losses and overcome the limitation of carrier multiplication. This study demonstrates the potential of spin-exchange carrier multiplication in advanced photoconversion.
Article
Chemistry, Physical
Xiang Wang, Zhen-Yu Yi, Yu-Qi Wang, Dong Wang, Li-Jun Wan
Summary: This study investigated the dynamic processes of methanol absorption and catalytic conversion on isolated single-atom Rh-N-4 sites using in situ electrochemical scanning tunneling microscopy. The results provided microscopic insights into the catalytic mechanism and reaction dynamics of methanol electrooxidation on Rh-N-4 sites, which is valuable for the rational design of high-performance catalysts.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Physics, Multidisciplinary
Walter Hahn, V. V. Dobrovitski
Summary: Long-lived coherences emerge under periodic pulse driving in disordered ensembles of strongly interacting spins, with potential for future quantum technologies. The physical origin and properties of this phenomenon remain poorly understood, but are found to exist in ensembles of different dimensionalities, from two-dimensional to infinite-dimensional systems. The transition between dimensions shows qualitatively similar long-time coherence dynamics, with dimensionality-dependent singularity in short-time behavior. The common physical origin of long-lived coherences is suggested to be a generic feature of strongly coupled spin systems with positional disorder. These results lay the foundation for utilizing long-lived coherences in various applications, ranging from quantum sensing to quantum information processing.
NEW JOURNAL OF PHYSICS
(2021)
Article
Chemistry, Physical
Zhaoyi Yang, Xiaofang Yang, Guangyu An, Dongsheng Wang
Summary: An electronic structure regulation strategy was used to optimize Fe-based heterogeneous catalyst for enhancing the activation of PMS. The single atom and nano-particle Fe-catalysts were modified with P-doping on carbon support and tested for BPA degradation. Results showed that catalysts with P-doping achieved 100% BPA degradation in 30 minutes, outperforming the single atom and nano-particle control groups (56% and 61% respectively). Experimental and DFT results revealed that P-doping increased the electron density of Fe and induced the transformation of its spin state, promoting electron transfer and generation of hydroxyl radicals.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)