Article
Engineering, Environmental
Heyan Jiang, Zujie Hu, Qian Zhou, Yue Li, Chuan Gan, Meilin Sheng, Xue Gao, Bin Sun
Summary: Photocatalytic lignin oils and CO2 upgradation to diesel precursors and H2/syngas production was achieved using electrostatic self-assembled CdSe QDs/B-SiO2 catalyst. The preparation of fuel precursors and H2 from lignin oils was efficiently realized with the noble metal free heterogeneous photocatalytic system in green solvent H2O (diesel precursors: 71-96%, H2: 6.0-7.3 mmol gcat-1). Furthermore, lignin oils and CO2 could be simultaneously transformed to diesel precursors and syngas with good to excellent yield (diesel precursors: 64%-87%, H2: 5.1-6.7 mmol gcat-1, CO: 5.2-5.6 mmol gcat-1). In the CdSe QDs/B-SiO2 system, the spherical SiO2 carrier facilitated the dispersion of CdSe QDs to provide more active sites. The enhancement of light absorption and utilization ability of CdSe QDs was achieved by the scattered light recycling in the near field of SiO2, thereby elevating the photocatalytic surface photoredox ability and enhancing the photocatalytic activity. The solvent-assisted light scattering ability enhancement further promoted the heterogeneous photocatalytic performance.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Nanoscience & Nanotechnology
Hao Hao, Hui-Ling Hu, Yi Liu, Feng-Lei Jiang
Summary: In this work, CdSe/ZnS core/shell quantum dots were synthesized and the dilution process of QDs was investigated. The addition of tertiary phosphine and alkylthiol was found to recover the photoluminescence intensity of diluted QDs and make them stable. Isothermal titration calorimetry revealed the exothermic and spontaneous interactions between TOP/OT and QDs.
ACS APPLIED NANO MATERIALS
(2023)
Article
Chemistry, Physical
Lorean Madriz, Mariano Parra, Fernando S. Garcia Einschlag, Oswaldo Nunez, Franco M. Cabrerizo, Ronald Vargas
Summary: The surface modification of Bi2WO6 with trans-4-stilbenecarboxaldehyde (4SCA) was studied for its application in photoredox reactions under solar irradiation. The modification process involved acetal-type interaction with the aldehyde at acidic pH followed by irreversible covalent functionalization at neutral pH. The modified Bi2WO6 showed improved efficiency in the mineralization of urea, with faster degradation as the initial urea concentration decreased.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Inorganic & Nuclear
Anukorn Phuruangrat, Saowaluk Buapoon, Thanaporn Bunluesak, Piyada Suebsom, Surangkana Wannapop, Titipun Thongtem, Somchai Thongtem
Summary: Undoped Bi2WO6 and Au-doped Bi2WO6 nanoplates were prepared and characterized. Au-doped Bi2WO6 nanoplates showed the highest photocatalytic activity under visible light irradiation.
SOLID STATE SCIENCES
(2022)
Article
Chemistry, Multidisciplinary
Zhiqiang Zhou, Jianfang Cen, Huixiao Wang, Yu Sun, Liyun Yang
Summary: The investigation on the functionalization process of quantum dots (QDs) using transferrin is very essential due to the high importance of transferrin in targeting tumor. The study found that both CdSe and CdSe@ZnS QDs triggered the fluorescence quenching of transferrin by the static quenching mechanism. The binding constant for CdSe@ZnS QDs was higher than CdSe QDs, indicating a stronger binding between CdSe@ZnS QDs and transferrin. The interaction between QDs and transferrin resulted in conformational changes of the latter and the release of iron ions from transferrin.
Article
Nanoscience & Nanotechnology
Yanbing Lv, Yucheng Yuan, Ning Hu, Na Jin, Dangdang Xu, Ruili Wu, Huaibin Shen, Ou Chen, Lin Song Li
Summary: This study presents a synthesis method for ultra-thick shell quantum dots and their application in C-reactive protein detection, achieving nearly a 3-fold enhancement in detection sensitivity and a 2-fold increase in shelf life. The performance improvements in protein detection are attributed to the use of core/shell quantum dots with high particle stability, high PL QYs, and a large surface area conducive to surface antibody coupling.
ACS APPLIED NANO MATERIALS
(2021)
Article
Chemistry, Physical
Xia Zhang, Hongpei Zhang, Junqi Yu, Zhenbin Wu, Qiaohong Zhou
Summary: A novel flower-like Co3O4 QDs/Bi2WO6 p-n heterostructure photocatalyst with enhanced visible light absorption and efficient degradation of tetracycline antibiotics was successfully prepared and characterized in this study.
APPLIED SURFACE SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Yibin Chen, Dan Luo, Yuelin Wei, Haining Liu, Yunfang Huang, Leqing Fan, Jihuai Wu
Summary: A novel CdSe/HSr2Nb3O10 n-n heterojunction was synthesized by hydrothermal reaction of CdSe quantum dots anchored on HSr2Nb3O10 nanosheets with microwave heating. The physicochemical properties of the composite were studied using various characterization techniques. The enhanced photocatalytic activity of the heterojunction was attributed to the n-n interface and the increased visible-light region. The CE50/HSNO-ns photocatalyst showed the highest photo-degradation efficiency, decomposing MO solution completely in just 5 minutes under visible light irradiation (lambda > 420 nm).
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2023)
Article
Optics
Simran Lambora, Asha Bhardwaj
Summary: In this study, blue emitting MoS2 quantum dots were synthesized through a colloidal method. The emission characteristics can be modified by altering the QD-dielectric interface. The interaction between the dispersing medium and MoS2 QDs was investigated, showing different optical behaviors in different dispersing dielectric media.
JOURNAL OF LUMINESCENCE
(2023)
Article
Chemistry, Physical
Lifeng Wang, Dongmei Xiang, Kaimin Gao, Junhui Wang, Kaifeng Wu
Summary: Colloidal n-doped CdSe and CdSe/ZnS nanoplatelets have been achieved through a photochemical doping method, demonstrating successful additional electron doping at the conduction band edge. The key to successful doping lies in a high surface ligand coverage, while unpassivated surface cations may lead to depletion of the doped electrons.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Zheng Zhang, Yuyang Kang, Li-Chang Yin, Ping Niu, Chao Zhen, Runze Chen, Xiangdong Kang, Fayu Wu, Gang Liu
Summary: Constructing type II heterostructures by utilizing porous g-C3N4 as substrate for CdSe quantum dots effectively enhances the photocatalytic hydrogen production activity, offering a feasible strategy for boosting visible light driven water splitting performance.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Arun Ashokan, Jiho Han, James A. Hutchison, Paul Mulvaney
Summary: We report an unexpected enhancement of photoluminescence (PL) in CdSe-based core/shell nanoplatelets (NPLs) upon electrochemical hole injection. Moderate hole doping densities induce an enhancement of more than 50% in PL intensity, accompanied by a narrowing and blue-shift of the PL spectrum. The hole-induced PL brightening in NPLs contrasts with the typical observation of PL quenching in CdSe-based quantum dots following hole injection. We propose that hole injection removes surface traps responsible for negative trions formation, thereby blocking nonradiative Auger processes. Continuous photoexcitation causes the enhanced PL intensity to decrease back to its initial level, indicating that photocharging is a key step in the loss of PL luminescence during normal aging. Modulation of the potential can be used for reversible enhancement or quenching of PL, enabling electro-optical switching.
Article
Chemistry, Physical
Shujuan Zhang, Shuhan Sun, Limin Song, Erming Liu
Summary: Chirality is introduced into photocatalysis by incorporating chiral L-cysteine into the preparation process of CdS quantum dots. The chiral CdS QDs show higher hydrogen production activity compared to nonchiral CdS QDs, which can be attributed to the broadened bandgap and stronger reducibility of photoelectrons resulting from the introduction of chiral ligands.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Multidisciplinary
A. S. Belousov, A. A. Parkhacheva, E. V. Suleimanov, I. Shafiq
Summary: Bismuth tungstate (Bi2WO6)-based photocatalytic materials are a hot research topic in photo-catalytic energy conversion and environmental remediation due to their advantageous properties. However, the rapid recombination of photogenerated charge carriers in pure semiconductors, including Bi2WO6, limits their activity. The preparation of heterojunctions based on Bi2WO6 has been proven as an efficient and promising strategy to overcome this challenge.
MATERIALS TODAY CHEMISTRY
(2023)
Article
Chemistry, Physical
Zhenqian Zhang, Yongzhou Lin, Fang Liu
Summary: The hybrid nanocrystals of cadmium sulfide (CdS) and bismuth tungstate (Bi2WO6) were successfully prepared in nanoreactors, showing excellent photocatalytic performance with superoxide ions and holes identified as the active species during the photocatalytic process.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
