Article
Chemistry, Physical
Yannic U. Staechelin, Michael Deffner, Sonja Krohn, Christian Castillo Delgadillo, Jan Steffen Niehaus, Holger Lange
Summary: By optical and THz pump-probe spectroscopy, we find that only shell-located electrons in quantum rods contribute to photoconductivity, while core-located carriers form immobile excitons that respond to external electrical fields.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Nanoscience & Nanotechnology
Marcel Boecker, Mathias Micheel, Alexander K. Mengele, Christof Neumann, Tilmann Herberger, Tommaso Marchesi D'Alvise, Bei Liu, Andreas Undisz, Sven Rau, Andrey Turchanin, Christopher Synatschke, Maria Waechtler, Tanja Weil
Summary: The study presents a photocatalytic system composed of CdSe@CdS nanorods coated with a PDA shell functionalized with molecular rhodium catalysts, demonstrating efficient charge transfer between the sensitizers and the catalysts. The system showed activity in light-driven reduction of NAD(+) to NADH, highlighting the potential of PDA-coated nanostructures for photocatalytic applications.
ACS APPLIED NANO MATERIALS
(2021)
Article
Chemistry, Physical
Tianwei Duan, Jing Ai, Sujie Chen, Gufeng He, Xiaojun Guo, Lu Han, Shunai Che, Yingying Duan
Summary: Researchers have fabricated chiral quantum dot-light-emitting diodes (CQLEDs) with circularly polarized electroluminescence (CPEL) through spin-coating evaporation of colloidal solution on a substrate. These CQLEDs have potential applications in future display, communication, and storage industries.
Article
Chemistry, Physical
Pascal Rusch, Franziska Lubkemann, Hadir Borg, J. Gerrit Eckert, Dirk Dorfs, Nadja C. Bigall
Summary: This study presents the assembly of CdSe/CdS dot/rod nanocrystals (NCs) with variable length of ZnS tips into aerogel networks. The networks have an intricate band structure, with holes confined to the CdSe cores and delocalized electrons within the CdS and connected building blocks. The ZnS tips act as a barrier, partly confining the electrons and allowing for tunable strength of coupling between the building blocks.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Yan Zhang, Haibing Zhang, Dongdong Chen, Cheng-Jun Sun, Yang Ren, Jianhui Jiang, Linjun Wang, Zheng Li, Xiaogang Peng
Summary: Zinc-blende CdS nanoplatelets with atomically flat {100} basal planes terminated by either Cd or S atoms were synthesized, showing different band gaps and optical properties. By precisely controlling the surface structure, it is possible to engineer the spatial distribution of excitons, opening up new possibilities for semiconductor nanocrystals.
Article
Chemistry, Physical
Sujuan Zhang, Gaoli Chen, Zhaowei Zhu, Ya Wang, Lei Wang, Sugang Meng, Xiuzhen Zheng, Xianliang Fu, Fuxiang Zhang, Weixin Huang, Shifu Chen
Summary: This study developed a strategy using Au/CdS nanocomposites for selective organic transformations, showing excellent charge separation and transfer performance, leading to increased efficiency in the oxidation of aromatic alcohols and reduction of nitroaromatic hydrocarbons.
JOURNAL OF CATALYSIS
(2021)
Article
Chemistry, Physical
Xiuqing Bai, Huiyu Li, Yonggang Peng, Guofeng Zhang, Changgang Yang, Wenli Guo, Xue Han, Jialu Li, Ruiyun Chen, Chengbing Qin, Jianyong Hu, Gaoling Yang, Haizheng Zhong, Liantuan Xiao, Suotang Jia
Summary: This study investigates the effect of aspect ratios of CdS nanorods on the photoluminescence emission of CdSe/CdS dot-in-rod nanocrystals using single-dot photoluminescence spectroscopy. The results show that as the aspect ratio increases, the photoluminescence quantum yield and lifetime decrease, while photoluminescence blinking is suppressed and the effect on the photoluminescence spectrum is less significant.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Nanoscience & Nanotechnology
Chandrasekar Perumal Veeramalai, Pratap Kollu, Guochen Lin, Xiaoming Zhang, Chuanbo Li
Summary: The integration of graphene with semiconducting quantum dots (QDs) in high-performance optoelectronic devices is demonstrated in this article. The device based on graphene: CdSe QDs/CdS nanorod heterostructures shows excellent operating characteristics, including a maximum photoresponsivity and specific detectivity under 530 nm light illumination. The study also investigates the enhancement of performance in the heterojunction photodetector with graphene nanosheets, showing that enhanced energy transfer and exciton generation contribute to increased light absorption and photocurrent density.
Article
Engineering, Electrical & Electronic
Ali Ciris, Bulent M. Basol, Yavuz Atasoy, Tayfur Kucukomeroglu, Abdullah Karaca, Murat Tomakin, Emin Bacaksiz
Summary: The interdiffusion between CdS-CdTe and CdSe-CdTe pairs was studied, showing that CdCl2 pretreatment can reduce the diffusion of S and Se into CdTe, thereby improving device performance.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2021)
Article
Optics
Patrick O'Keeffe, Daniele Catone, Lorenzo Di Mario, Francesco Toschi, Michele Magnozzi, Francesco Bisio, Alessandro Alabastri, Remo Proietti Zaccaria, Andrea Toma, Giuseppe Della Valle, Alessandra Paladini
Summary: This study focuses on the analysis of nonthermal electrons generated by plasmonic nanostructures upon light excitation, highlighting the challenge of separating nonthermal and thermal electron contributions in femtosecond transient absorption spectroscopy (FTAS). By introducing a combined approach involving post-processing of FTAS measurements guided by a simplified semiclassical model, the purely nonthermal contribution to pump-probe experimental data for 2D arrays of gold nanoellipsoids was successfully isolated. This approach reveals the close relationship between electron energy and probe photon energy during ultrafast electron thermalization, shedding new insights on the transient optical response of gold nanostructures and aiding in the development of optimized plasmonic configurations for nonthermal electron generation.
LASER & PHOTONICS REVIEWS
(2021)
Article
Physics, Multidisciplinary
Yu A. Pusep, M. D. Teodoro, V Laurindo Jr, E. R. Cardozo de Oliveira, G. M. Gusev, A. K. Bakarov
Summary: The diffusion of photogenerated holes in a high-mobility mesoscopic GaAs channel is studied, and it is found that the injection of holes leads to the formation of a hydrodynamic three-component mixture consisting of electrons and photogenerated heavy and light holes.
PHYSICAL REVIEW LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Daniel Zambo, Anja Schlosser, Rebecca T. Graf, Pascal Rusch, Patrick A. Kissling, Armin Feldhoff, Nadja C. Bigall
Summary: This article demonstrates a method for preparing hybrid nanoparticle networks from aqueous nanocrystal solutions, showing synthetic control over a variety of hybrid nanostructures. The optical features are studied to reveal charge carrier separation and controllable fluorescence quenching, emphasizing the importance of fine-tuning the conduction band/Fermi level offset. This procedure provides a novel platform for preparing photo(electro)catalytically promising hybrid nanostructures without the need of presynthetic hybrid particle design.
ADVANCED OPTICAL MATERIALS
(2021)
Article
Chemistry, Physical
R. Arulmozhi, A. John Peter
Summary: The binding energies of intra- and interwell excitons in the CdS/CdSe/CdS asymmetric quantum well were studied by varying the size of the right well under the polaronic effect. Transition energy, transition lifetime, oscillator strength, and absorption coefficients were measured. The results showed that the peak absorption coefficient was larger for direct excitons compared to indirect excitons, with a longer radiative lifetime for the latter.
CHEMICAL PHYSICS LETTERS
(2021)
Article
Chemistry, Physical
Aron P. Veenstra, Pascal Rauthe, Joseph Czekner, Jakob Hauns, Andreas-Neil Unterreiner, Manfred M. Kappes
Summary: We compared the intersystem crossing rate of Rose Bengal in different conditions with the corresponding rate of isolated species in the gas phase. The solution showed similar lifetime to the solvated dianion chromophores, while the isolated dianion had a much longer lifetime. Both transient absorption and photoelectron spectroscopy measurements exhibited similar oscillatory features. The findings have important implications for understanding the photophysics of Rose Bengal and interpretation of solution measurements.
JOURNAL OF PHYSICAL CHEMISTRY A
(2022)
Article
Chemistry, Physical
Kunisato Kuroi, Masaki Yamada, Ibuki Kawamura, Minkyo Jung, Chan-Gi Pack, Fumihiko Fujii
Summary: Semiconductor nanocrystals (SNCs) are important optical tools in life sciences and their application to living systems requires their surfaces to be covered with biocompatible molecules. This study investigates the ligand-exchange reaction of glutathione (GSH) on rod-shaped CdSe/CdS SNCs using Fourier-transform infrared (FTIR) absorption spectroscopy. The findings reveal that the surface molar fraction of GSH linearly impacts the physical properties of SNCs.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Leyla Najafi, Reinier Oropesa-Nunez, Sebastiano Bellani, Beatriz Martin-Garcia, Lea Pasquale, Michele Serri, Filippo Drago, Jan Luxa, Zdenek Sofer, David Sedmidubsky, Rosaria Brescia, Simone Lauciello, Marilena Zappia, Dipak Shinde, Liberato Manna, Francesco Bonaccorso
Summary: The research focuses on synthesizing metallic rutile VO2 (VO2 (R)) nanosheets by topochemical transforming liquid-phase exfoliated VSe2, resulting in 2D non-layered materials with porous morphology and high catalytic activity for water splitting reactions in both acidic and alkaline media.
Article
Chemistry, Multidisciplinary
Francesco Zaccaria, Baowei Zhang, Luca Goldoni, Muhammad Imran, Juliette Zito, Bas van Beek, Simone Lauciello, Luca De Trizio, Liberato Manna, Ivan Infante
Summary: In this study, the interaction between CsPbBr3 nanocrystals passivated with didodecyldimethylammonium bromide (DDABr) and a series of acid/base ligands was investigated using computational and experimental approaches. It was found that the nanocrystals were inert towards most ligands, but showed reactivity towards carboxylic, phosphonic, and sulfonic acids. Oleic and oleylphosphonic acids were found to interact with surface-bound DDA molecules, causing displacement of DDABr. Despite the stripping of DDA ligands, the optical properties, structure, and morphology of the nanocrystals remained largely unaffected.
Article
Multidisciplinary Sciences
Stefano Toso, Muhammad Imran, Enrico Mugnaioli, Anna Moliterni, Rocco Caliandro, Nadine J. Schrenker, Andrea Pianetti, Juliette Zito, Francesco Zaccaria, Ye Wu, Mauro Gemmi, Cinzia Giannini, Sergio Brovelli, Ivan Infante, Sara Bals, Liberato Manna
Summary: This article introduces the importance of colloidal chemistry and its application in materials synthesis. By using perovskite nanocrystals as templates, researchers have successfully achieved the phase-selective synthesis of two previously unexplored lead sulfochlorides. This method avoids impurities and allows for the production of phase-pure products.
NATURE COMMUNICATIONS
(2022)
Review
Materials Science, Multidisciplinary
Mahdi Malekshahi Byranvand, Clara Otero-Martinez, Junzhi Ye, Weiwei Zuo, Liberato Manna, Michael Saliba, Robert L. Z. Hoye, Lakshminarayana Polavarapu
Summary: Lead-halide perovskites have revolutionized optoelectronics, with high efficiencies achieved in solar cells and LEDs. However, the instability of the photoactive phase is a major concern for commercialization. Mixed cation perovskites have been found to improve phase stability and device performance reproducibility.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Jence T. Mulder, Michael S. Meijer, J. Jasper van Blaaderen, Indy du Fosse, Kellie Jenkinson, Sara Bals, Liberato Manna, Arjan J. Houtepen
Summary: Yb:YLF nanocrystals with an undoped YLF shell can achieve high photoluminescence quantum yield (PLQY) and reduce concentration quenching, making them highly promising for various applications.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Danila Quarta, Stefano Toso, Gabriele Saleh, Rocco Caliandro, Anna Moliterni, Andrea Griesi, Giorgio Divitini, Ivan Infante, Giuseppe Gigli, Cinzia Giannini, Liberato Manna, Carlo Giansante
Summary: We have developed a colloidal synthesis method for bismuth chalcohalide nanocrystals with a hexagonal phase. The structure of these nanocrystals can be described by the Bi13S18X2 (where X = Br and I) model. It was found that the presence of Bi24+ dimers, formed by columns of Bi atoms, and Peierls-type distortions are responsible for the anomalously low band gap and intervalence charge transfer in this material. Our findings and synthetic approach provide fundamental understanding for the use of hexagonal bismuth chalcohalides in diverse applications such as photocatalysis and thermoelectrics.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Physical
Michele Failla, Fransisco Garcia Florez, Bastiaan B. V. Salzmann, Daniel Vanmaekelbergh, Henk T. C. Stoof, Laurens D. A. Siebbeles
Summary: In this study, the initial nature and relaxation of photoexcited electronic states in CdSe nanoplatelets were investigated using ultrafast transient optical absorption measurements and theoretical analysis. It was found that the initial quantum yields of excitons and charge carriers vary with photon energy, and thermal relaxation occurs within 1 ps. No signatures of biexcitons or larger complexes were observed up to the highest average number of absorbed photons per NPL in the experiments.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Review
Materials Science, Multidisciplinary
Aniruddha Ray, Luca De Trizio, Juliette Zito, Ivan Infante, Liberato Manna, Ahmed L. L. Abdelhady
Summary: Remarkable progress has been made in recent years in the development of low-dimensional perovskite-related materials. Various low-dimensional metal halide nanocrystals have been synthesized and investigated for compounds with low toxicity. These nanocrystals crystallize in various structures and dimensionalities, often exhibiting exciting optical properties. The improvement/manipulation of light emission from these nanocrystals and the possible origin of their light emission are discussed in this review, along with comparisons to their bulk counterparts and future research directions.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Sarika Kumari, Jose G. Sanchez, Muhammad Imran, Ece Aktas, Dora A. Gonzalez, Liberato Manna, Eugenia Martinez-Ferrero, Emilio Palomares
Summary: This study reports the use of two carbazole-based self-assembled molecules as hole injecting materials in perovskite-based LEDs. The extra phenyl ring in the bridge of these molecules provides improved stability to the devices, surpassing the widely used polymer PTAA. Additionally, the efficiency of the devices is increased due to the structural and electronic characteristics of the self-assembled molecules.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Chemistry, Physical
Fulvio Bellato, Michele Ferri, Abinaya Annamalai, Mirko Prato, Luca Leoncino, Rosaria Brescia, Luca De Trizio, Liberato Manna
Summary: We present the first colloidal synthesis of NiAs nanocrystals and their performance as electrocatalysts for water splitting reactions. The NiAs nanocrystals exhibit high activity for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), surpassing the performance of benchmark materials. The study highlights the potential of transition metal arsenides as emerging materials for electrocatalytic applications.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Marco van der Laan, Edwin Heemskerk, Floris Kienhuis, Nella Diepeveen, Deepika Poonia, Sachin Kinge, Minh Triet Dang, Van An Dinh, Laurens D. A. Siebbeles, Anna Isaeva, Jorik van de Groep, Peter Schall
Summary: Rhenium disulfide is a unique 2D van der Waals material with anisotropy and weak interlayer interactions, confining excitons within single atomic layers. The influence of different interlayer coupling on excitonic properties in AA and AB-stacked rhenium disulfide is explored using polarization-dependent optical measurements. The results show that while the excitonic properties are largely determined by in-plane interactions, they are strongly modified by interlayer coupling, making ReS2 an excellent platform for studying stacking as a tuning parameter for 2D materials. Additionally, its optical anisotropy makes it an interesting candidate for polarization-sensitive applications.
Article
Chemistry, Physical
Michele Failla, Fransisco Garcia Florez, Bastiaan B. V. Salzmann, Daniel Vanmaekelbergh, Henk T. C. Stoof, Laurens D. A. Siebbeles
Summary: We studied the initial nature and relaxation of photoexcited electronic states in CdSe nanoplatelets (NPLs) using ultrafast transient optical absorption measurements and theoretical analysis. The quantum yields of heavy-hole (HH) excitons, light-hole (LH) excitons, and charge carriers vary strongly with photon energy, while thermal relaxation occurs within 1 ps. We observed no signs of biexcitons or larger complexes, except when a probe-generated exciton interacted with a previously produced exciton.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Salvatore Cosseddu, Roberta Pascazio, Carlo Giansante, Liberato Manna, Ivan Infante
Summary: In this paper, classical molecular dynamics (MD) simulations were employed to investigate the locations, binding modes and mobilities of carboxylate ligands on the different facets of CdSe nanocrystals. The results suggest that these features are influenced by the temperature of the system and the coordination number of the surface (Cd and Se) atoms. High ligand mobilities and structural rearrangements are observed with low coordination of Cd atoms, while undercoordinated Se atoms are found to form spontaneously on the nanosecond timescale, potentially playing a role in photoluminescence quenching.
Article
Chemistry, Physical
Sourav Maiti, Laurens D. A. Siebbeles
Summary: In this Perspective, recent advances in harvesting triplets for photovoltaic and photon upconversion applications are overviewed. The two angles discussed are singlet fission-sensitized solar cells and triplet-triplet annihilation upconversion using transition metal dichalcogenides (TMDCs) and organic semiconductors.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Review
Chemistry, Multidisciplinary
Fangze Liu, Rong Wu, Yicheng Zeng, Jing Wei, Hongbo Li, Liberato Manna, Aditya D. Mohite
Summary: This article introduces the application of halide perovskites as particle radiation detectors. Halide perovskites have superior properties and can detect different types of particle radiation.
