Article
Chemistry, Inorganic & Nuclear
Chuqiao Wu, Shuting Zhang, Yuhui Zheng, Aiqi Wang, Qiming Zhao, Wenjie Sun, Wanqiang Liu, Chenggang Long, Qianming Wang
Summary: In this article, a solvent-type passivation (STP) strategy is introduced to achieve better control and reproducibility of sulfur dots by using short-chain molecular species instead of polyethylene glycol (PEG) as the capping agent. The strategy does not require PEG or any other capping agent, and the surface defects of sulfur dots are passivated by sodium ethoxide generated through the direct reaction of ethanol with NaOH. The sulfur dots obtained through this strategy show self-quenching resistant feature in the solid state and an extended fluorescence band up to 645 nm.
INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Physical
Yexi Li, Dongniu Fan, Ning Sui, Liang Li, Fangfei Li, Xiaochun Chi, Zhihui Kang, Qiang Zhou, Hanzhuang Zhang, Cuili Cui, Yinghui Wang
Summary: PVDF films embedded with different FAPbBr3 (FA = formamidinium) nanocrystals have been synthesized using a fast and direct method, and photodetectors utilizing these films have been fabricated. The relationship between optoelectronic performance and carrier kinetics in the composite film affected by synthesis temperature has been analyzed using transient absorption and temperature-dependent spectroscopy. A primitive fixable light-sensitive detector has been fabricated to broaden the application of PVDF films embedded with different FAPbBr3 nanocrystals in the optoelectronics field. Our results suggest that PVDF films embedded with perovskite nanocrystals can be applied in various semiconductor devices.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Materials Science, Ceramics
Rongqing Jiang, Hanwei Wu, Kai Li, Wenchao Zhang, Yunlan Guo, Jing Wang, Chao Liu
Summary: In this study, the influence of Na2O concentration on the precipitation of CdSe quantum dots (QDs) in glasses is investigated. It is found that higher Na2O concentration leads to decreased connectivity and solubility of Se in the glass, resulting in the formation of Se-related clusters and lower temperature for the precipitation of CdSe QDs. In glasses with lower Na2O concentration, defect-related photoluminescence (PL) is suppressed and the overall PL changes from dual band to narrow band with tunable wavelength in the visible range. Glasses with higher Na2O concentration only exhibit dual band PL due to phase separation during high temperature heat-treatment. These results demonstrate that the PL properties of QDs in glasses can be modulated by adjusting the glass composition and structure.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2023)
Article
Materials Science, Multidisciplinary
Marta Valles-Pelarda, Andres F. Gualdron-Reyes, Carles Felip-Leon, Cesar A. Angulo-Pachon, Said Agouram, Vicente Munoz-Sanjose, Juan F. Miravet, Francisco Galindo, Ivan Mora-Sero
Summary: The study successfully embedded CsPbBr3 quantum dots in two molecular organogels, achieving green and blue emission with high PLQY for the blue emission. This opens up a new avenue for synthesizing blue-emissive PQDs with high optical performance through post-synthetic treatment.
ADVANCED OPTICAL MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Olawale Oloye, James D. Riches, Anthony P. O'Mullane
Summary: Room temperature liquid metals are being explored as sonochemical catalysts for the degradation of organic azo dyes, producing non-toxic solid carbon particles. The process can be repeated multiple times with the same catalyst to produce differently sized particles.
CHEMICAL COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Rui Li, Junjun Liu, Chunlei Xia, Tanglue Feng, Zhicheng Zhu, Bai Yang
Summary: The development of high-performance solid state luminescent carbon-based nanomaterials presents challenges. In this study, strong blue-green fluorescent carbonized polymer dots (CPDs) called oABT-TSA-CPDs were synthesized with an absolute photoluminescence quantum yield (PLQY) of 76% in solid state without matrix. The carbon core state and surface state associated with a carbonyl group were identified as the source of strong fluorescence emission in the solid state. The mechanism of enhanced emission from ethanol solution (PLQY = 7%) to powder (PLQY = 76%) was investigated and confirmed as the fixation of PL centers.
CHINESE CHEMICAL LETTERS
(2023)
Article
Nanoscience & Nanotechnology
Romain Platel, Etienne Palleau, Louis Vaure, Simon Raffy, Francois Guerin, Celine Nayral, Fabien Delpech, Laurence Ressier
Summary: The microimprinting technology proposed here offers a new method for directly tagging the surface of an object, verifying products and storing traceability data and emitting optical signals, which can be used on various surfaces and materials, and is suitable for a variety of quantum dots. It can be used manually or implemented in a production line, and the key experimental parameters influencing signal contrast are investigated, demonstrating technical capabilities through various tagging use cases.
ACS APPLIED NANO MATERIALS
(2021)
Article
Biochemistry & Molecular Biology
Ilia Litvinov, Anna Salova, Nikolay Aksenov, Elena Kornilova, Tatiana Belyaeva
Summary: In this study, the photophysical characteristics of core/shell InP/ZnS quantum dots (InP-QDs) were analyzed in cell culture medium, salt solutions, and directly in the cells. It was found that InP-QDs were internalized into endolysosomes in HeLa and A549 cells with similar dynamics to Cd-based QDs, but the two cell lines accumulated them differently. InP-QDs were reliably detected in the endosomes despite their low quantum yields. Factors such as cell culture medium, acidic pH, and salt solutions were found to affect the photoluminescence lifetime of InP-QDs. The scatter between endosomes in the same cell was observed, indicating the complex impact of these factors on the state of InP-QDs. The toxicity of InP-QDs for both cell lines at concentrations higher than 20 nM was demonstrated.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Engineering, Chemical
Jiale Gao, Youyu Jia, Jiwei Xu, Zhikun Yan, Yifan Li
Summary: Polyelectrolyte-based mixed matrix membranes with quaternary ammonium poly (ether ether ketone) as the polymer matrix and nanoscale sulfonated TiO2 quantum dots as the functional filler were synthesized. The incorporation of the filler induced the formation of segregated and ordered ionic cluster domains, leading to enhanced CO2 permeability and selectivity. The role of the filler as a structure modifier was elucidated, and the membranes showed comparable separation performance even without alkaline treatment.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Engineering, Electrical & Electronic
Zein K. Heiba, Mohamed Bakr Mohamed, Noura M. Farag, Ali Badawi
Summary: In this study, Nano Mn0.95M0.05S (M equivalent to Cu, Mg) samples were prepared using the molten salt solid state reaction method. The X-ray diffraction and Fourier transform infrared techniques were applied to analyze the phase structure and characteristic vibrations of the samples. The results showed that Cu and Mg were successfully incorporated into the MnS lattice, and the doped nano MnS samples exhibited suitable colors for LED applications.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Chemistry, Physical
Fang Yao, Ruiming Li, Zhenglin Jia, Songxue Bai, Yujie Yang, Yanyan Li, Yalun Xu, Guojia Fang, Qianqian Lin
Summary: Chalcogenide-based semiconductors are highly promising for optoelectronic devices due to their low toxicity, cost-effectiveness, stability, and tunable properties. However, limited understanding of charge recombination mechanisms and trap states hinders their development. A comprehensive study on bismuth-based chalcogenide thin films was conducted to investigate the influence of post-treatments. The key findings were that post-treatment with Bi enhanced crystallinity and mobility but also increased carrier density, while post-treatment with sulfur increased carrier lifetime and mobility by passivating trap states.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Physical
Koichiro Suzuki, Toshihiro Kuzuya, Yasushi Hamanaka
Summary: Surface modification plays a crucial role in improving fluorescence properties of semiconductor nanoparticles. The bandedge emission characteristic has been observed in AgInS2 NPs but not in most other I-III-VI2 NPs. In this study, luminescence modifications of CuInS2 NPs were examined after postsynthesis treatment with TOP ligands. Although the bandedge emission was not generated, the TOP treatment significantly improved the luminescence quantum yield.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Multidisciplinary
R. Sanchez-Alarcon, J. Noguera-Gomez, V. S. Chirvony, H. Pashaei Adl, Pablo P. Boix, G. Alarcon-Flores, J. P. Martinez-Pastor, R. Abargues
Summary: CsPbI3 perovskite nanocrystals suffer from phase stability issues, which can be overcome by synthesizing mixed halide CsPbBr3-xIx NCs. Spray coating for solid-state anion exchange in CsPbBr3 NCs thin films is a novel technology to manufacture high optical quality and high PLQY CsPbBr3-xIx NC thin films.
Review
Environmental Sciences
Chanchal Das, Mika Sillanpaa, Shabi Abbas Zaidi, Moonis Ali Khan, Goutam Biswas
Summary: Urbanization and population growth have led to a significant increase in solid waste generation, projected to reach 3.40 billion tons by 2050. Carbon-based quantum dots (Cb-QDs) derived from solid wastes have attracted research interest due to their wide range of applications. This review focuses on the conversion of solid wastes into useful materials for pollution reduction, specifically investigating sustainable synthesis routes of carbon quantum dots (CQDs), graphene quantum dots (GQDs), and graphene oxide quantum dots (GOQDs). The applications of these quantum dots in various fields are also discussed, along with the challenges in implementing existing synthesis methods and future research directions.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Chemistry, Multidisciplinary
Arianne Brooks, Xiao-Liu Chu, Zhe Liu, Ruediger Schott, Arne Ludwig, Andreas D. Wieck, Leonardo Midolo, Peter Lodahl, Nir Rotenberg
Summary: Tailored photonics cavities are used to enhance light-matter interactions, creating a fully coherent quantum interface. An integrated microdisk cavity containing self-assembled quantum dots is reported here, showing coherent routing of photons and clear signatures of coherent scattering by the quantum dots. Control of photon routing between access waveguides is achieved by tuning the quantum dot and resonator detuning or adjusting the excitation beam strength, with a critical photon number less than one photon per lifetime being required.
Article
Chemistry, Physical
Yuanyuan Li, Xiaoyu Liu, Tianyuan Liang, Wenjie Liu, Jiyang Fan
Summary: The study shows that SiC quantum dots with small dimensions can naturally oxidize at a lower temperature to form core/shell and heteroepitaxial SiC/SiO2 quantum dots. The surface silica layer enhances the quantum efficiency by improving the carrier potential barrier and reducing the nonradiative transition rate, making it suitable for nanoscale electronic and photonic devices.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Xiaoyu Liu, Yuanyuan Li, Tianyuan Liang, Wenjie Liu, Jiyang Fan
Summary: This study investigates the photodynamics of six novel types of low-dimensional hybrid copper halides, revealing two origins of photon emission with distinct temperature dependence. Experimental and first-principles calculations identify two types of self-trapped excitons (STEs) as the sources of photon emission. The softness of the organic cations in the copper halide plays a crucial role in determining the self-trapping type of the STEs.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Tianyuan Liang, Wenjie Liu, Xiaoyu Liu, Yuanyuan Li, Jiyang Fan
Summary: Patterned metal halide perovskites exhibit unique photophysical properties and high performance in photonic applications. A UV continuous wave laser can induce in situ crystallization of CsPbBr3 quantum dots inside CsPb2Br5 microplatelets, leading to high-Purcell-effect-enhanced cavity mode spontaneous emission. The luminescence shows a superlinear emission intensity-excitation intensity relation, suggesting the possibility of stimulated emission at higher photon concentrations.
Article
Nanoscience & Nanotechnology
Chengyu Zhang, Dejian Dai, Guo Zhao, Wei Lu, Jiyang Fan
Summary: This study reveals the mechanism of proton fluorescence quenching through experiments and theoretical calculations. It is found that the strong interaction between protons and fluorophore groups leads to a decrease in energy gap, resulting in fluorescence quenching in the visible spectral region. Additionally, protons generated by the hydrolysis of different metal ions can efficiently quench fluorescence, and the quenching efficiency is related to the hydrolysis constant of the metal ion.
Article
Materials Science, Multidisciplinary
Dejian Dai, Chengyu Zhang, Nguyen Thi Dieu Thuy, Guo Zhao, Wei Lu, Jiyang Fan
Summary: This study reveals for the first time the fluorescence quenching mechanism of colloidal carbon dots (CDs) by mercury ions (Hg2+). Experimental results show that Hg2+ interacts with the polarized fluorophores on the CD surface through strong attraction, leading to efficient electron transfer and fluorescence quenching.
DIAMOND AND RELATED MATERIALS
(2022)
Article
Chemistry, Physical
Xiaonan Xi, Yuanyuan Li, Tianyuan Liang, Huaxin Wu, Ruonan Miao, Chao Gu, Jiyang Fan
Summary: The study presents the fabrication of epitaxial pyramidal ZnO-Au HNCs and investigates their unique photophysical properties. Strong coupling between ZnO NC green defect-related recombination and localized surface plasmon resonance of Au nanospheres leads to nearly complete quenching of green defect luminescence in the ZnO NCs.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Wenjie Ma, Huaxin Wu, Xiaoyu Liu, Ruonan Miao, Tianyuan Liang, Jiyang Fan
Summary: In this study, the photodynamic properties of cadmium-based double perovskite nanoparticles were investigated using both experimental and density functional theory calculations. The results revealed that the alloying of the nanoparticles significantly influenced their photoluminescence, with the substitution of certain atoms leading to crystal symmetry breaking and enhanced exciton localization. This study provides important insights into the photophysics of perovskite nanocrystals and their potential applications in solid-state lighting.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Physics, Applied
Huaxin Wu, Wenjie Liu, Wenjie Ma, Tianyuan Liang, Xiaoyu Liu, Jiyang Fan
Summary: This study investigates the optical properties of Cs3Bi2Br9 nanoplatelets using a combination of experimental and first-principles calculation methods. The results show that the material exhibits blue and green emissions, which are attributed to two kinds of shallow color centers. Additionally, Raman spectroscopy reveals both active and inactive vibrational modes, providing insight into the unique photodynamics of these semiconductor nanocrystals.
APPLIED PHYSICS LETTERS
(2022)
Article
Physics, Applied
Xuan Ji, Tianyuan Liang, Ruonan Miao, Jiahuan Zhu, Jiali Xing, Ziqin Wang, Jiyang Fan
Summary: SiC is a crucial template for epitaxially growing other semiconductors due to its excellent mechanical and electrical properties. Researchers have succeeded in conformally epitaxial growth of lead halide perovskites on red-luminescent 6H-SiC nanowire arrays. The small lattice mismatch between SiC and CsPbBr3 allows for perfect heteroepitaxial growth, resulting in intense multiband blue luminescence and prolonged lifetime of the perovskite nanostructures.
APPLIED PHYSICS EXPRESS
(2023)
Article
Chemistry, Physical
Wenjie Liu, Huaxin Wu, Tianyuan Liang, Ruonan Miao, Saba Riaz, Jiyang Fan
Summary: We investigate the roles of intrinsic point defects in the photophysics of Cs(3)Bi(2)Br(9) using statistical and theoretical calculations. Our calculations show the existence of an exciton peak below the interband absorption edge, resolving an experimental debate. Native defects with deep thermodynamic transition levels are found to be energetically favorable. Bromide self-interstitials within the octahedron bilayers act as efficient carrier trapping centers through non-radiative recombination, explaining the observed blue luminescence.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Physical
Wenxia Zhang, Huaxin Wu, Fujia Zeng, Yuchan Wang, Xiaosheng Tang, Xianghong Niu, Jiyang Fan
Summary: Transition-metal doping alters the photophysical properties of perovskite nanocrystals, but the underlying thermal and optical processes in such symmetry-breaking nanosystems are not clear. We studied the temperature-dependent delocalized exciton and transition-metal ion-captured carrier recombination processes in manganese-doped CsPbBr0.6Cl2.4 nanocrystals. Experimental and theoretical studies show that exciton ionization and carrier capture by manganese ions play dominant roles in the manganese ions-dominated recombination process. Density functional theory calculations confirm that thermally enhanced nonadiabatic electron-phonon coupling promotes carrier localization.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Analytical
Jingwei Zhang, Wei Lu, Xingliang Jian, Qingying Hu, Dejian Dai
Summary: In this paper, a nondestructive detection method for egg freshness based on infrared thermal imaging technology was proposed. The relationship between egg thermal infrared images (different shell colors and cleanliness levels) and egg freshness under heating conditions was studied. Through the establishment of a finite element model of egg heat conduction, the optimal heat excitation temperature and time were determined. The study also showed that infrared thermography combined with deep learning algorithms could detect egg freshness with an accuracy of over 94%.
Article
Materials Science, Multidisciplinary
Yimin Yang, Huaxin Wu, Yuanyuan Li, Fan Kong, Jiyang Fan
Summary: The surface enhanced Raman scattering (SERS) of semiconductors has been a hot research topic. This study investigates the SERS activation of vertically etched hydrogen-terminated mesoporous Si films. The results show that the thin mesoporous Si layer with small pore dimensions has a very low limit of detection for adsorbed rhodamine 6 G molecules, which is attributed to the suppressed diffusion of the molecules in the pores.
Article
Engineering, Electrical & Electronic
Qingying Hu, Wei Lu, Hui Luo, Dejian Dai, Yingming Deng, Aiguo Song
Summary: This study proposed a noncontact measurement method utilizing an air puff combined with structured light imaging (ASLI) to measure food texture parameters. The airflow impact model was simulated using finite-element simulation method, and the detection device and 3-D feature extraction algorithms were developed. The results showed that the ensemble learning model with extracted concave parameters achieved the highest accuracy.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2023)
