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Ligand Engineering for Improved All‐Inorganic Perovskite Quantum Dot‐MoS <sub/>2</sub> Monolayer Mixed Dimensional van der Waals Phototransistor
摘要： Combining intriguing physical properties of 2D crystals and intrinsically remarkable optical properties of halide perovskite quantum dots (QDs), the 0D–2D perovskite QD–based mixed dimensional van der Waals heterostructure (MvdWH) is considered as promising for optoelectronic applications. Even though the interfacial electronic structure of MvdWHs is sufficiently engineered to manipulate the charge carrier behavior, the issue of interfacial charge transfer efficiency originating from the residue ligands that are inevitably introduced by the QDs is still prominently remained. From this perspective, for the first time, a solution-processed surface ligand density control strategy is demonstrated to balance the QD surface passivation and the interfacial charge carrier extraction and injection efficiency in the 0D–2D MvdWH system. The accurate adjustment of ligand density outside QDs enables the subsequent modulation on interfacial charge carrier transfer efficiency from the aspect of electronic and optoelectronic properties. Furthermore, such kind of ligand engineering toward MvdWH interface is substantially demonstrated in a photogating mechanism–based phototransistor with an improved photoresponsivity as high as 1.13 × 105 A W?1. These results may push forward the evolution of 0D–2D mixed dimensional van der Waals optoelectronics.
关键词： mixed-dimensional van der Waals heterostructures,perovskite quantum dots,phototransistors,MoS2,ligand engineering
更新于2025-11-14 17:04:02
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Surface Functionalisation of Upconversion Nanoparticles with Different Moieties for Biomedical Applications
摘要： Lanthanide ion-doped upconversion nanoparticles (UCNPs) that can convert low-energy infrared photons into high-energy visible and ultraviolet photons, are becoming highly sought-after for advanced biomedical and biophotonics applications. Their unique luminescent properties enable UCNPs to be applied for diagnosis, including biolabeling, biosensing, bioimaging, and multiple imaging modality, as well as therapeutic treatments including photothermal and photodynamic therapy, bio-reductive chemotherapy and drug delivery. For the employment of the inorganic nanomaterials into biological environments, it is critical to bridge the gap in between nanoparticles and biomolecules via surface modifications and subsequent functionalisation. This work reviews the various ways to surface modify and functionalise UCNPs so as to impart different functional molecular groups to the UCNPs surfaces for a broad range of applications in biomedical areas. We discussed commonly used base functionalities, including carboxyl, amino and thiol moieties that are typically imparted to UCNP surfaces so as to provide further functional capacity.
关键词： lanthanide,functionalisation,silanisation,surface modification,ligand engineering,nanoparticles,upconversion
更新于2025-09-23 15:22:29
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Ligand engineering of colloid quantum dots and their application in all-inorganic tandem solar cells
摘要： How to effectively utilize the energy of the broad spectrum of sunlight is one of the basic problems in the research of tandem solar cells. Due to their size effect, quantum confinement effect and coupling effect, colloidal quantum dots (QDs) exhibit new physical properties that bulk materials don’t possess. CdX (X=Se, S, etc.) and PbX (X=Se, S, etc.) QDs prepared by hot-injection methods have been widely studied in the areas of photovolitaic devices. However, the surfactants surrounding QDs seriously hinder the charge transport of QDs based solar cells. Therefore, how to fabricate high-performance tandem solar cells via ligands engineering has become a major challenge. In this paper, the latest progress of colloidal QDs in the research of all-inorganic tandem solar cells was summarized. Firstly, the improvement of QDs surface ligands and the optimization of ligands engineering were discussed, and the control of the physical properties of QDs films were realized. From the aspects of colloidal QDs, ligand engineering, and solar cell preparation, the future development direction of colloidal QDs solar cells was proposed, providing technical guidances for the preparation of low-cost and high-efficiency nanocrystalline solar cells.
关键词： Tandem solar cell,Colloidal quantum dots,Hot-injection method,Ligand engineering
更新于2025-09-23 15:19:57
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Thiophene insertion for continuous modulation of the photoelectronic properties of triphenylamine-based metal–organic frameworks for photocatalytic sulfonylation–cyclisation of activated alkenes
摘要： Pharmaceutically meaningful conversions like photocatalytic sulfonylation call for the precise control of the photoelectronic properties of photocatalysts. A ligand engineering strategy of inserting different numbers of thiophenes into the scaffold of triphenylamine (TPA)-based ligands was developed to improve the visible light absorption, enhance the oxidation potentials of the ground states, and decrease the reduction potentials of the excited states, providing a powerful tool for continuous modulation of the photoelectronic properties of metal–organic framework (MOF)-based heterogeneous photocatalysts. The ligand inserted with two thiophenes was found to possess a well-balanced photoelectronic performance, endowing the corresponding MOF Zn–BCTA with good visible light-harvesting ability and a moderate excited-state reduction potential with minimal over-potential for photoinduced generation of sulfonyl radicals while avoiding the competitive over-reduction of the sulfonyl moieties. The breaking of the C3-symmetry of the TPA-based ligand forged a distorted coordination geometry of the Zn4O nodes of the MOF to provide potential active sites to facilitate the fixation and activation of α,β-unsaturated carbonyl substrates, and the two-fold interpenetrated frameworks further enhanced the spatial proximity between the encapsulated substrate and the photoredox-active centre. The synergy of the well-tuned photoelectronic properties of Zn–BCTA and the spatial confinement effect within the pores benefited the tandem sulfonylation–cyclisation of unsaturated alkenes in an efficient and diastereoselective mode for the construction of bio-interesting sulphoyl isoquinolinediones/oxindoles.
关键词： ligand engineering,sulfonylation,cyclisation,metal–organic frameworks,photocatalysis
更新于2025-09-19 17:15:36