Article
Chemistry, Multidisciplinary
Julia Nette, Federico Montanarella, Chenglian Zhu, Taras V. V. Sekh, Simon C. C. Boehme, Maryna I. I. Bodnarchuk, Gabriele Raino, Philip D. D. Howes, Maksym V. V. Kovalenko, Andrew J. J. deMello
Summary: The study presents the highly controlled, microfluidic template-assisted self-assembly of CsPbBr3 nanocrystals into spherical supraparticles, achieving precise control over average supraparticle size by varying the nanocrystal concentration and droplet size. This enables the synthesis of highly monodisperse, sub-micron supraparticles (with diameters between 280 and 700 nm).
CHEMICAL COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Stefania Milanese, Giovanni Morello, Maria Luisa De Giorgi, Arianna Creti, Hordii Andrusiv, Maryna I. Bodnarchuk, Antonio Qualtieri, Mauro Lomascolo, Maksym Kovalenko, Marco Anni
Summary: Fully inorganic lead halide perovskite nanocrystals (NCs) are being studied as active materials for photonic and optoelectronic devices. This research investigates the Amplified Spontaneous Emission (ASE) properties of lecithin-capped CsPbBr3 NCs thin films and their dependence on the surrounding environment. The study demonstrates low ASE threshold and reversible emission quenching induced by ambient air exposure, making lecithin-capped CsPbBr3 NCs thin films promising for the development of high sensitivity optical humidity sensors.
MATERIALS TODAY PHYSICS
(2023)
Article
Chemistry, Physical
Anthony Kipkorir, Xiuyu Jin, Haifeng Gao, Prashant V. Kamat
Summary: In-situ polymer capping with polymethyl acrylate improves the colloidal stability of CsPbBr3 nanocrystals, making them more suitable for photocatalysis in polar medium. The electron transfer properties of PMA-capped CsPbBr3 nanocrystals were studied using viologen molecules as electron acceptors. The binding affinity of viologen molecules with PMA-capped CsPbBr3 was significantly higher than that with oleic acid/oleylamine-capped ones. The results also show that the alkyl chain length of the viologen molecule affects charge separation efficiency and net electron transfer quantum yield.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Qiliang Zhu, Fan Ye, Wei Yan, Jingrun Zhu, Jianhua Shen, Kan-Hao Xue, Yihua Zhu, Chunzhong Li
Summary: A surface reconstruction strategy is used to synthesize CsPbBr3/CsPb2Br5 core/shell nanocrystals with a uniform coating structure, which exhibit excellent optoelectronic properties and good stability. The core/shell structure is characterized at the atomic scale, and the binding energy between the CsPb2Br5 (116) facet and the CsPbBr3 (100) facet is revealed by density functional theory calculations. The prepared core/shell perovskite nanocrystals can maintain photoluminescence emission after >30 days in water.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Christine Adelle Rico-Yuson, Supamas Danwittayakul, Sivanappan Kumar, G. Louis Hornyak, Tanujjal Bora
Summary: We present a facile, versatile, and efficient technique for growing CsPbBr3 films in ambient conditions, allowing for nano-scale control and potential large-scale production. The optimized CsPbBr3 films demonstrate comparable photovoltaic performance to those prepared using traditional methods, showcasing good scalability and suitability.
JOURNAL OF MATERIALS SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Manav Raj Kar, Shamit Kumar, Tusar Kanta Acharya, Chandan Goswami, Saikat Bhaumik
Summary: Recently, CsPbX3 (X= Cl, Br, I) nanocrystals (NCs) have shown promise for optoelectronic applications, particularly in bioimaging, due to their superior photophysical properties. However, their poor stability in aqueous media poses a challenge. To address this, we developed a fast and reproducible synthesis method that coats CsPbBr3 NCs with long-chained organic ligands/polymers. Among them, polyvinylpyrrolidone (PVP) encapsulated NCs exhibit highly luminescent properties and improved stability when incorporated with n-isopropyl acrylamide (NIPAM). These polymer-coated NCs demonstrate better water stability, smaller particle size, uniform distribution, higher structural stability, and increased dispersivity, making them suitable as fluorescent probes for live cell imaging. The dosage of Pb-ions in the polymer-coated NCs is calculated to be below 5 μg/mL, enabling safe live cell imaging. This work provides valuable insights for expanding the application of these NCs in bioimaging with higher sensitivity.
Article
Chemistry, Analytical
Ruifen Sun, Xiumin Yu, Jie Chen, Weiwei Zhang, Yun Huang, Jingcheng Zheng, Yuwu Chi
Summary: In this study, highly electrochemiluminescent perovskite quantum dots (PQDs) were synthesized by optimizing the synthesis conditions. The volume of the precursor solution, concentrations of CsBr and PbBr2, amount of capping reagents, and synthesis reaction temperature were found to significantly affect the ECL activity of PQDs. The new PQDs, characterized as hybrids of 3D PQDs and 0D PQDs with unique morphologies, exhibited much higher ECL activity compared to prevailing 3D PQDs. These novel PQDs were successfully applied for the ECL sensing of bisphenol A, showing promising potential in analytical chemistry.
ANALYTICAL CHEMISTRY
(2022)
Article
Chemistry, Inorganic & Nuclear
Yifei Zhao, Fangrui Cheng, Shuai Zhang, Ruirui Yang, Man Li, Hong Ming, Shi Ye
Summary: This study fabricates highly luminescent CsPbBr3 NC embedded Cs4PbBr6 MCs using an anti-solvent reprecipitation method. The formation mechanism of the MCs is investigated through density functional theory (DFT) calculations. The MCs show improved thermal stability compared to conventional CsPbBr3 NCs and demonstrate great potential in lighting and display applications.
DALTON TRANSACTIONS
(2022)
Article
Chemistry, Multidisciplinary
Arghyadeep Garai, E. Krishnan Vishnu, Souvik Banerjee, Anoop Ajaya Kumar Nair, Suman Bera, K. George Thomas, Narayan Pradhan
Summary: The design of cube-connected nanorods is achieved by connecting seed nanocrystals of a specific shape in a certain orientation or by selectively etching facets of preformed nanorods. In lead halide perovskite nanostructures, patterned nanorods with anisotropic direction can be designed along the edge, vertex, or facet of seed cubes. By adjusting the length of host metal halides, the lengths of the nanorods can be tuned from 100 nm to nearly 1000 nm. The efficient coupling of wave functions in vertex-oriented cube assemblies allows for exciton delocalization in cube-connected nanorods, providing valuable insights into the chemistry of assembling anisotropic halide perovskite nanostructures as conducting wires.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
HanKyul Lee, Hyunwoo Jo, Jong Ik Lee, Agni Raj Koirala, Hwichan Cho, Wansoo Huh, Moon Sung Kang
Summary: The charge carrier density of copper sulfide nanocrystals (Cu2-xS NCs) is sensitive to variations in the atomic composition, which determines the nature of sulfur bonding in the lattice. Fine control of the composition of Cu2-xS NCs enables the tuning of electronic properties of materials for use in electronic devices.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Chemistry, Analytical
Xiaodong Luan, Shuochen Fan, Ke Xu, Haipeng Zhang, Xiaoyang Feng, Wenteng Zhang, Huaping Peng, Qile Li
Summary: A novel ligand-assisted reprecipitation method was proposed for synthesizing aqueous-phase CsPbBr3 nanocrystals, which exhibited a fluorescence intensity of 51% after 120 hours. By using cesium trifluoroacetate (Cs-TFA) as a multifunctional additive, the nanocrystals showed significant anodic electrochemiluminescence (ECL) and stable cathodic ECL performances.
Article
Chemistry, Multidisciplinary
Yuting Cai, Peijuan Zhang, Wenhao Bai, Lu Lu, Le Wang, Xi Chen, Rong-Jun Xie
Summary: The room-temperature ligand-assisted reprecipitation (LARP) technique has been established for synthesizing lead halide perovskite nanocrystals (PNCs) on a large scale. By using anisole as the reaction solvent and avoiding the need for antisolvents, the method significantly improves the purity and photoluminescence quantum yield (PLQY) of the synthesized PNCs. Furthermore, the PNCs can be easily coated with polystyrene using a mild polymerization method, resulting in composites with enhanced luminescence efficiency and stability. The fabricated composite materials demonstrate the potential for producing super-wide color gamut backlights with high luminous efficacy.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2022)
Article
Materials Science, Multidisciplinary
Naji Vahedigharehchopogh, Erdinc Erol, Orhan Kibrisli, Aziz Genc, Miray Celikbilek Ersundu, Ali Ercin Ersundu
Summary: The embedding of CsPbBr3 perovskite quantum dots in glass provides protection and isolation of toxic elements. This study demonstrates the potential of recycling CsPbBr3 PQD GNCs and their high performance in LED applications.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Review
Biochemistry & Molecular Biology
Fahong Yin, Zhaohai Qin
Summary: Long-chain molecules are important in agricultural production and are widely used as fungicides, insecticides, acaricides, herbicides, and plant growth regulators. This review specifically focuses on the agricultural biological activities and applications of long-chain molecules. The utilization of long-chain molecules in pesticide development is an attractive approach for designing novel pesticide compounds. By providing valuable insights, this article serves as a useful reference for the design of new long-chain molecules for pesticide applications.
Article
Chemistry, Physical
Magdalena Kulpa-Greszta, Maciej Wnuk, Anna Tomaszewska, Jagoda Adamczyk-Grochala, Andrzej Dziedzic, Iwona Rzeszutek, Bartosz Zarychta, Dominika Bloniarz, Anna Lewinska, Robert Pazik
Summary: The anisotropy of magnetic nanoparticles has been controlled by modifying their shape, and the efficiency of energy conversion and their effects on normal and cancer cells have been studied. Specific shape nanoparticles induce cell death, while lower concentrations stimulate antioxidative and anti-inflammatory response in normal cells.
JOURNAL OF PHYSICAL CHEMISTRY B
(2022)
Article
Multidisciplinary Sciences
Evan Lafalce, Eric Amerling, Zhi-Gang Yu, Peter C. Sercel, Luisa Whittaker-Brooks, Z. Valy Vardeny
Summary: The authors investigate the inversion symmetry breaking and Rashba effect in hybrid organic-inorganic lead-halide perovskites using two-photon absorption spectroscopy. The results show the presence of Rashba splitting in these materials and the inversion symmetry breaking is induced by ionic impurities. This finding is of great significance for understanding the spintronics and optoelectronics properties of these materials.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Moritz Gramlich, Michael W. Swift, Carola Lampe, John L. Lyons, Markus Doeblinger, Alexander L. Efros, Peter C. Sercel, Alexander S. Urban
Summary: Semiconductor nanoplatelets exhibit thickness-dependent bright-dark exciton splitting, affecting the optical properties of the thinnest nanoplatelets. This phenomenon, revealed through temperature-resolved and time-resolved studies, can be generalized to isotropically or anisotropically confined nanostructures.
Article
Chemistry, Multidisciplinary
Ihor Cherniukh, Taras Sekh, Gabriele Raino, Olivia J. Ashton, Max Burian, Alex Travesset, Modestos Athanasiou, Andreas Manoli, Rohit Abraham John, Mania Svyrydenko, Viktoriia Morad, Yevhen Shynkarenko, Federico Montanarella, Denys Naumenko, Heinz Amenitsch, Grigorios Itskos, Rainer F. Mahrt, Thilo Stoeferle, Rolf Erni, Maksym Kovalenko, Maryna Bodnarchuk
Summary: Nanocrystal self-assembly is a versatile platform for materials engineering at the mesoscale, and can lead to a wide range of structural diversity. This study explores the self-assembly of luminescent cubic CsPbBr3 nanocrystals with other building blocks of different shapes, resulting in various binary superlattices with high packing density. The structures formed have potential applications in materials engineering.
Article
Chemistry, Physical
Oliviero Cannelli, Julia Wiktor, Nicola Colonna, Ludmila Leroy, Michele Puppin, Camila Bacellar, Ilia Sadykov, Franziska Krieg, Grigory Smolentsev, Maksym V. Kovalenko, Alfredo Pasquarello, Majed Chergui, Giulia F. Mancini
Summary: A comprehensive microscopic description of thermally induced distortions in lead halide perovskites has been provided in this study. The effects of thermal activation in CsPbBr3 nanocrystals were quantified across length scales with atomic-level precision. The temperature increase was found to significantly enhance the short-range structural distortions of the lead halide framework due to phonon anharmonicity. The study also proposed a framework for the description of phase transitions in lead halide perovskites.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Multidisciplinary Sciences
Uyen N. Huynh, Ye Liu, Ashish Chanana, Dipak R. Khanal, Peter C. Sercel, Jinsong Huang, Z. Valy Vardeny
Summary: Utilizing the spin degree of freedom of photoexcitations in hybrid organic inorganic perovskites for quantum information science applications has been proposed and explored. In this study, the authors investigated quantum beating oscillations in the circularly polarized photoinduced reflection of single crystal methyl-ammonium tri-iodine perovskite (MAPbI(3)) and observed two quantum beating oscillations whose frequencies depend on the crystal orientation. They identified these oscillations as being caused by positive and negative trions and measured the spin coherence time of electrons and holes using the technique of resonant spin amplification.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Yaoyao Han, Wenfei Liang, Xuyang Lin, Yulu Li, Fengke Sun, Fan Zhang, Peter C. Sercel, Kaifeng Wu
Summary: The study reports strong bright-exciton fine-structure splitting in solution-processed CsPbI3 perovskite quantum dots, which is robust to quantum dot size and shape heterogeneity and increases with decreasing temperature. The splitting is found to be associated with orthorhombic distortion of the perovskite lattice.
Article
Chemistry, Multidisciplinary
Yi Xie, Jack Morgenstein, Benjamin G. G. Bobay, Ruyi Song, Naidel A. M. S. Caturello, Peter C. C. Sercel, Volker Blum, David B. B. Mitzi
Summary: Cation mixing in 2D HOIP structures is an important factor for modifying organic templating effects and tailoring inorganic structures. In this study, a chiral-chiral mixed-cation system is demonstrated, where a small amount of chiral cation S-2-MeBA can be doped into S-BrMBA(2)PbI4 to modulate the structural symmetry. The concentration of S-2-MeBA determines the structural change from higher symmetry state (C2) to the lowest symmetry state (P1). Atomic occupancy analysis suggests that a specific S-BrMBA cation site is preferentially substituted by S-2-MeBA. The chiral cation doping system provides a material design strategy for enhancing emergent properties sensitive to symmetry breaking.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
Chuang Zhang, Xiaomei Jiang, Peter C. Sercel, Haipeng Lu, Matthew C. Beard, Stephen McGill, Dmitry Semenov, Z. Valy Vardeny
Summary: A comprehensive study of the exciton fine structure in 2D-phenethylammonium lead iodide films was conducted. Three exciton bands associated with bound, dark, and bright excitons were identified in the photoluminescence spectrum. Under high magnetic field, circular/linear polarization of the photoluminescence band related to the dark exciton was observed. The anomalous circular polarization of the dark exciton cannot be explained by the classical Boltzmann distribution, but can be explained by an effective mass model.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Peter C. Sercel, Alexander L. Efros
Summary: We theoretically demonstrate that giant magnetic circular dichroism (MCD) can be observed in two-dimensional (2D) semiconductors with Rashba splitting and a perpendicular magnetic field. This phenomenon is reflected in the calculated absorption coefficients for transitions between Landau levels (LLs) of conduction and valence bands. The giant MCD signal is attributed to the unique magnetic field dependence of the lowest LL in the presence of the Rashba term. Another characteristic of Rashba splitting is a decrease in the exciton diamagnetic shift caused by the Rashba terms. The analysis of the exciton dispersion at nonzero momentum reveals mixed magneto-impulse terms resulting in a negative diamagnetic shift, which can be observed in the exciton photoluminescence.
Article
Chemistry, Physical
Federica Bertolotti, Nicola Dengo, Antonio Cervellino, Maryna I. Bodnarchuk, Caterina Bernasconi, Ihor Cherniukh, Yuliia Berezovska, Simon C. Boehme, Maksym V. Kovalenko, Norberto Masciocchi, Antonietta Guagliardi
Summary: Lead halide perovskite nanocrystals exhibit excellent photoemission properties, easy and inexpensive preparation, and structural versatility. In this study, reciprocal space X-ray total scattering analysis was used to determine accurate lattice distortions, bond distances, and angles as a function of nanocrystal size. The results showed that lattice anisotropy increased with decreasing size, and lattice distortion behaved differently at different sizes. Bond distances did not show a size dependence, while angles were more symmetric in smaller sizes. Additionally, the study found statically disordered octahedral tilts at low temperatures.
Article
Chemistry, Multidisciplinary
Ben P. Carwithen, Thomas R. Hopper, Ziyuan Ge, Navendu Mondal, Tong Wang, Rozana Mazlumian, Xijia Zheng, Franziska Krieg, Federico Montanarella, Georgian Nedelcu, Martin Kroll, Miguel Albaladejo Siguan, Jarvist M. Frost, Karl Leo, Yana Vaynzof, Maryna I. Bodnarchuk, Maksym V. Kovalenko, Artem A. Bakulin
Summary: This study investigates the carrier cooling process in size-controlled lead halide perovskite nanomaterials using ultrafast pump-push-probe spectroscopy. The results show that there is only a weak size effect on the cooling dynamics in cuboidal nanocrystals, while the hot phonon bottleneck effect commonly observed in bulk perovskites is suppressed in two-dimensional systems.
Article
Materials Science, Multidisciplinary
Paris Papagiorgis, Marios Sergides, Andreas Manoli, Modestos Athanasiou, Caterina Bernasconi, Fedros Galatopoulos, Apostolos Ioakeimidis, Constantinos Nicolaides, Epameinondas Leontidis, Theodossis Trypiniotis, Stelios Choulis, Maryna I. Bodnarchuk, Maksym V. Kovalenko, Andreas Othonos, Grigorios Itskos
Summary: Ligand exchange during or after the colloidal synthesis of nanocrystals enables the production of conductive nanocrystal solids for optoelectronics. A post-synthetic ligand washing process was developed, leading to increased photoconductance and improved optoelectronic properties for both FAPbI3 and CsPbBr3 nanocrystals.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Chemistry, Physical
Nathaniel. P. Gallop, Dmitry R. Maslennikov, Navendu Mondal, Katelyn P. Goetz, Zhenbang Dai, Aaron M. Schankler, Woongmo Sung, Satoshi Nihonyanagi, Tahei Tahara, Maryna I. Bodnarchuk, Maksym V. Kovalenko, Yana Vaynzof, Andrew M. Rappe, Artem A. Bakulin
Summary: Vibrational control through optical stimulation of structural dynamics can effectively reduce non-radiative recombination and voltage losses in perovskite solar cells.
Article
Physics, Multidisciplinary
Nuri Yazdani, Maryna I. Bodnarchuk, Federica Bertolotti, Norberto Masciocchi, Ina Fureraj, Burak Guzelturk, Benjamin L. Cotts, Marc Zajac, Gabriele Raino, Maximilian Jansen, Simon C. Boehme, Maksym Yarema, Ming-Fu Lin, Michael Kozina, Alexander Reid, Xiaozhe Shen, Stephen Weathersby, Xijie Wang, Eric Vauthey, Antonietta Guagliardi, Maksym V. Kovalenko, Vanessa Wood, Aaron M. Lindenberg
Summary: Understanding the electron-phonon coupling in lead halide perovskites is important for interpreting and utilizing their optical and electronic properties. This study shows that photoexcitation leads to lattice reorganization through deformation potential coupling to low-energy optical phonons. The coupling strength is stronger in FAPbBr3 due to its disordered crystal structure. The reorganizations induced by each exciton in a multi-excitonic state constructively interfere, resulting in a coupling strength that scales quadratically with the exciton number.