JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Yingzhen Wu,Lin Lin,Zheng Li,Yanan Zhang,Zhuohong Feng,Zhezhe Wang,Zhiqiang Zheng
Up to now, the research field of application of lanthanide ions doped lead-free double perovskite Cs 2 AgInCl 6 nanocrystals (NCs) was relatively limited, even less in temperature sensing. Here, Tb 3+ /Ho 3+ /Bi 3+ ions were successfully doped into Cs 2 AgInCl 6 NCs by hot-injection. The temperature sensing performance of co-doped NCs by using the fluorescence intensity ratio (FIR) was studied through the temperature-dependent emission spectra . By analyzing the influence of ions' doping concentration on temperature sensing performance, the optimal doping concentration of co-doped Cs 2 AgInCl 6 NCs was determined to be 7 % Tb 3+ , 20 % Ho 3+ and 1 % Bi 3+ . The highest absolute and relative sensitivities reach 1.48 K −1 and 2.48 %/K, respectively. We provide a new doping scheme of lead-free double perovskite NCs which have good temperature sensing performance. This co-doped NCs have great potential application value in non-contact temperature sensing in nanoscale .
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Chemistry
·
2023
·
IF 7.3
Haijiang Qiu,Jianing Wu,Min Li,Zhenyu Hu,Song Yang,Yanyan Li,Yingying Gu,Hongrui Cheng,Yuanhui Zheng
Gallium nitride quantum dots (GaN QDs), as a third-generation semiconductor material, are usually synthesized through a vapor deposition method at an elevated temperature (typically ≥800 °C). Thermal injection method is rarely reported for the synthesis of GaN QDs due to the lack of active precursors and the require of harsh reaction conditions. Here, we report the fabrication of oxygen doped colloidal GaN QDs via rapid thermal injection. By screening the reaction temperature and solvent, well-dispersed GaN QDs with a size of 3.8 nm were obtained in octadecylamine (ODA) at 360 °C. The synthesized GaN QDs show blue emission, the maximum emission wavelength is about 440 nm, and the photoluminescence quantum yield is 14.3%. Furthermore, we reveal the donor-acceptor mechanism of blue emission from GaN QDs. During the growth of GaN QDs, oxygen atoms occupy some nitrogen sites and produce a shallow oxygen donor energy level (O N ). A part of the O N can be combined with the adjacent gallium vacancy (V Ga ) to form a V Ga -O N acceptor, whose energy level is about 0.98 eV above the valence band of GaN QDs. The transition of excited electrons from the donor (O N ) to the acceptor (V Ga -O N ) is responsible for the blue emission of GaN QDs.
✓ 已验证
产品关联
DOI
高影响因子
Small Methods
·
2023
·
IF 12.4
Shanhong Wan,Shanshan Xiao,Mingquan Li,Xin Wang,Khak Ho Lim,Min Hong,Maria Ibáñez,Andreu Cabot,Yu Liu
Developing cost-effective and high-performance thermoelectric (TE) materials to assemble efficient TE devices presents a multitude of challenges and opportunities. Cu 3 SbSe 4 is a promising p -type TE material based on relatively earth abundant elements. However, the challenge lies in its poor electrical conductivity. Herein, an efficient and scalable solution-based approach is developed to synthesize high-quality Cu 3 SbSe 4 nanocrystals doped with Pb at the Sb site. After ligand displacement and annealing treatments, the dried powders are consolidated into dense pellets, and their TE properties are investigated. Pb doping effectively increases the charge carrier concentration, resulting in a significant increase in electrical conductivity, while the Seebeck coefficients remain consistently high. The calculated band structure shows that Pb doping induces band convergence, thereby increasing the effective mass. Furthermore, the large ionic radius of Pb 2+ results in the generation of additional point and plane defects and interphases, dramatically enhancing phonon scattering, which significantly decreases the lattice thermal conductivity at high temperatures. Overall, a maximum figure of merit ( zT max ) ≈ 0.85 at 653 K is obtained in Cu 3 Sb 0.97 Pb 0.03 Se 4 . This represents a 1.6-fold increase compared to the undoped sample and exceeds most doped Cu 3 SbSe 4 -based materials produced by solid-state, demonstrating advantages of versatility and cost-effectiveness using a solution-based technology.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Zhongjie Cui,Shuaitao Qin,Haiyang He,Zhuoqi Wen,Dan Yang,Zhiyan Piao,Shiliang Mei,Wanlu Zhang,Ruiqian Guo
As a kind of luminescent nanomaterial, InP quantum dots (QDs) have been regarded as one of the most potential nontoxic alternatives for cadmium-based QDs in the light-emitting devices, and much progress has been obtained recently. However, their growth kinetics remains not fully revealed yet, and the effects of the shelling process on as-synthesized InP cores have been rarely investigated. Herein, the growth kinetics of InP QDs is investigated via the convenient method of varying halide ions, and their sequential growth is proposed according to the discontinuous evolution of their first exciton absorption peaks, especially the observed typical positions, which is different from the reported continuous evolution previously and means that the specific sized InP cores appeared during the growth stage. Moreover, the impacts of ZnS are analyzed from the quantum confinement effect of ZnS on InP cores with different sizes and interfacial heterovalent bonds. The coordination between these two aspects decides the final positions of the first exciton absorption peaks of InP/ZnS QDs. Compared with the positions of the first exciton absorption peaks of bare InP QDs, insufficient confinement of the ZnS shell to small InP cores causes the red-shift, but the heterovalent bonds at the interface cause the blue-shift. Furthermore, the emissions of final InP/ZnS QDs are influenced, and the emission from 484 to 578 nm is obtained via this facile synthetic protocol. It is thought that this study can reveal the growth of InP QDs and provide guidance to design rational InP-based QDs with desired emission and high performance, contributing to the fabrication of efficient light-emitting devices.
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2023
·
IF 29.4
Ying Chen,Zeyu Liang,Qiyue Wang,Lin Xiao,Shangzhi Xie,Shengfei Yang,Xun Liu,Daishun Ling,Fangyuan Li
The alpha-synuclein (α-syn) oligomers hold a central role in the pathology of Parkinson's disease (PD). Achieving accurate detection of α-syn oligomers in vivo presents a promising avenue for early and accurate diagnosis of PD. Magnetic resonance imaging (MRI), with non-invasion and exceptional tissue penetration, offers a potent tool for visualizing α-syn oligomers in vivo. Nonetheless, ensuring diagnostic specificity remains a formidable challenge. Herein, a novel MRI probe (ASOSN) is introduced, which encompasses highly sensitive antiferromagnetic nanoparticles functionalized with single-chain fragment variable antibodies, endowing it with the capacity for discerning recognition and binding to α-syn oligomers and triggering a switchable T1–T2 MRI signal. Significantly, ASOSN possesses the unique capability to accurately discriminate α-syn oligomers from neuroinflammation in vivo. Moreover, ASOSN facilitates the non-invasive and precise visualizing of endogenous α-syn oligomers in living systems. This innovative design heralds the development of a non-invasive visualization strategy for α-syn oligomers, marking a pivotal advancement for early and accurate diagnosis of PD.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2020
·Vol. 26
·期 35
·7955-7960
·
IF 4.857
Bingquan Jia,Du Sun,Wei Zhao,Fangfang Xu,Fuqiang Huang
Graphical Ball control : A new synthetic method based on CdNCN nanoparticle anion exchange reactions was developed to access solid or hollow CdSe nanocrystals with tunable size, which exhibit narrow width of photoluminescence features. The obtained CdNCN@CdS heterostructures with modulated shell/core thickness show a remarkable improvement in photocatalysis compared to CdS or CdNCN NPs of similar size. Semiconductor nanocrystals of tunable shell/core configurations have great potential in photo-driven applications such as photoluminescence and photocatalysis, but few strategies realize a controllable synthesis with respect to both the size of the core and the shell with high crystallinity. Here, a new synthetic method based on cadmium cyanamide (CdNCN) nanoparticle anion exchange reactions was developed to access solid or hollow CdSe nanocrystals with tunable size and CdNCN@CdS heterostructures with modulated shell/core thickness. The gradual shift and narrow width of photoluminescence features demonstrate the high crystallinity and monodispersity of the resulting CdSe nanocrystals. In the CdNCN@CdS heterostructures, synergistic effects of the photocarrier separation is observed between the CdS shell and CdNCN core, which leads to great improvement in photocatalysis with optimized shell/core ratio.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Qing-Lan Li,Duo Wang,Yuanzheng Cui,Zhiying Fan,Li Ren,Dongdong Li,Jihong Yu
A novel multifunctional drug delivery system has been constructed by assembling per-6-thio-β-cyclodextrin-modified ultrasmall CuS nanoparticles (CD-CuS) onto fluorescent AIEgen-containing mesoporous silica nanoparticles (FMSN). The CD-CuS nanoparticles are anchored on the surface of benzimidazole-grafted FMSN, acting as a gatekeeper and photothermal agent. The prepared blue-emitting nanocomposite (FMSN@CuS) exhibits good biocompatibility and cell imaging capability. Anticancer drug doxorubicin hydrochloride (DOX) molecules are loaded into FMSN@CuS, and zero prerelease at physiological pH (7.4) and on-demand drug release at an acidic environment can be achieved due to the pH-responsive gate-opening of CD-CuS only at an acidic condition. The FMSN@CuS nanocomposite can generate obvious thermal effect after the exposure of 808 nm laser, which can also accelerate the DOX release. Meanwhile, the fluorescence intensity of DOX-loaded FMSN@CuS increases with the release of DOX, and the intracellular drug release process can be tracked according to the change of luminescence intensity. More importantly, DOX-loaded FMSN@CuS displays efficient anticancer effects in vitro upon 808 nm laser irradiation, demonstrating a good synergistic therapeutic effect via combining enhanced chemotherapy and photothermal therapy.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2023
·
IF 4.4
Hongye Liu,Qianwen Li,Yan Ma,Siyu Wang,Yanan Wang,Bing Zhao,Lichun Zhao,Ziping Jiang,Lili Xu,Weidong Ruan
Surface-enhanced Raman scattering (SERS) has outstanding merits in biochemical molecular analysis, and the development of new SERS substrates is the focus of research. Herein, In 2 O 3 nanoparticles (NPs) were synthesized by a high temperature pyrolysis method with cubic phase and small particle size at 10 nm. The structures and properties of In 2 O 3 NPs were characterized by X–ray powder diffraction (XRD), transmission electron microscope (TEM) and other characterization methods. Additionally, the SERS spectra of In 2 O 3 -MBA with the enhancement factor ( EF ) up to 1.22 × 10 4 is discussed. The results demonstrate that there is a charge transfer (CT) effect revealed between the adsorbed molecules of 4-mercaptobenzoic acid (4-MBA) and the substrates of In 2 O 3 NPs, and it could be excited by long wavelength energy. Based on the In 2 O 3 NPs, the study is beneficial to develop more potential semiconductor SERS substrates.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Jiahang Zhou,Lingui Hu,Minqiang Xia,Yixuan Du,Yunbo Li
Ultrathin gold nanowires (AuNWs) play an important role in wearable devices, biological detection, and other fields. However, their applications in transparent conduction are limited due to high junction resistance caused by the oleyamine (OAm) ligand and structural instability caused by Rayleigh instability. A treatment method has been proposed to eliminate these two defects via a hydrogen sulfide (H2S) atmosphere and heat treatment. The nanowires are subjected to heat treatment in a hydrogen sulfide atmosphere, which induces the nanowires to fracture into gold particles (AuNPs) and evolve into a stable spider-web-like structure. As a result, the conductivity of the treated film is significantly improved, reaching 65 Ω/sq at 120 °C, 50 min, and 1000 ppm of H2S. The electrical properties of the film can be maintained for more than one month. This method suggests a promising approach to ultrathin AuNWs for excellent improvement of electronic conduction and stability, which can be used in wearable devices.
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2023
·
IF 13.3
Rui Gao,Wanqing Xu,Zhiqing Wang,Fen Li,Yueli Liu,Guogang Li,Keqiang Chen
Synthesis of upconversion nanoparticles (UCNPs)-metal halide perovskites (MHPs) heterostructure is garnered immense attentions due to their unparalleled photophysical properties. However, the obvious difference in their structural forms makes it a huge challenge. Herein, hexagonal β-NaYF 4 and hexagonal Cs 4 PbBr 6 are filtrated to construct the UCNP/MHP heterostructural luminescent material. The similarity in their crystal structures facilitate the heteroepitaxial growth of Cs 4 PbBr 6 on the surface of β-NaYF 4 NPs, leading to the formation of high-quality β-NaYF 4 :Yb,Tm/Cs 4 PbBr 6 core/shell nanocrystals (NCs). Interestingly, this heterostructure endows the core/shell NCs with typically narrow-band green emission centered at 524 nm under 980 nm excitation, which should be attributed to the Förster resonance energy transfer (FRET) from Tm 3+ to Cs 4 PbBr 6 . It is noteworthy that the FRET efficiency of β-NaYF 4 :Yb,Tm/Cs 4 PbBr 6 core/shell NCs (58.33%) is much higher than that of the physically mixed sample (1.84%). In addition, the reduced defect density, lattice anchoring effect, as well as diluted ionic bonding proportion induced by the core/shell structure further increase the excellent water-resistance and thermal cycling stability of Cs 4 PbBr 6 . These findings open up a new way to construct UCNP/MHP heterostructure with better multi-code luminescence performance and stability and promote its wide optoelectronic applications.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials
·
2023
·Vol. 16
·期 17
·6010
·
IF 3.4
Longfei Yuan,Taixin Zhou,Fengmin Jin,Guohong Liang,Yuxiang Liao,Aijuan Zhao,Wenbo Yan
Transmission electron microscopy (TEM) is an excellent characterization method to analyze the size, morphology, crystalline state, and microstructure of perovskite quantum dots (PeQDs). Nevertheless, the electron beam of TEM as an illumination source provides high energy, which causes morphological variation (fusion and melting) and recession of the crystalline structure in low radiolysis tolerance specimens. Hence, a novel and facile strategy is proposed: electron beam peel [PbBr6]4−octahedron defects from the surface of QDs to optimize the crystal structure. TEM and high-angle annular dark-field scanning TEM (HAADF) tests indicate that the [PbBr6]4−octahedron would be peeled from the surface of QDs when QDs samples were irradiated under high-power irradiation, and then a clear image would be obtained. To avoid interference from a protective film of “carbon deposits” on the surface of the sample when using high resolution TEM, amorphous carbon film (15–20 nm) was deposited on the surface of QDs film and then characterized by TEM and HAADF. The detection consequences showed that the defection of PbBr2on the surface of QDs will gradually disappear with the extension of radiation time, which further verifies the conjecture.Keywords:transmission electron microscopy;perovskite quantum dots;[PbBr6]4−octahedron;defect
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Kaiyang Xu,Yu Chen,Hua Yang,Yuyan Gan,Lizhi Wu,Li Tan,Yihu Dai,Yu Tang
Cyclohexanone is an important raw material for manufacturing nylon and other chemicals. The sustainable conversion of biomass derived molecules to cyclohexanone is desired but still challenging. Herein, a palladium single atom catalyst anchored in the micropores of zeolite (namely Pd 1 /ZSM-5) is designed and exhibits remarkable catalytic activity in transforming anisole to cyclohexanone in water medium (H 2 O), without using of organic solvent or halogen promoter. The selectivity to cyclohexanone is 91.2% and the turnover rate (TOR) is 400.8 h −1 at 453 K. The Pd sites, acid sites, and microporous confinement environment of zeolite cooperate to promote the partial hydrogenation to cyclohexanone, and inhibit further hydrogenation as the side reaction. H 2 O not only acts as the solvent, but also participates significantly in the partial hydrogenation. Moreover, as revealed by isotope labelled experiments (D 2 O and H 2 18 O), the water participated hydrogenolysis and the consequent partial hydrogenation mechanism is proposed.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）