ACS Applied Bio Materials
·
2023
·
IF 4.7
Dan Zhao,Shibo Peng,Hanzhang Xiao,Qilong Li,Yahong Chai,Hongxia Sun,Ruping Liu,Li Yao,Lin Ma
Iron oxide nanoparticles (IONPs) have been developed as contrast agents for T1- or T2-weighted magnetic resonance imaging (MRI) on account of their excellent physicochemical and biological properties. However, general strategies to improve longitudinal relaxivity (r1) often decrease transverse relaxivity (r2), thus synchronously strengthening the T1 and T2 enhancement effect of IONPs remains a challenge. Here, we report interface regulation and size tailoring of a group of FePt@Fe3O4 core–shell nanoparticles (NPs), which possess high r1 and r2 relaxivities. The increase of r1 and r2 is due to the enhancement of the saturation magnetization (Ms), which is a result of the strengthened exchange coupling across the core–shell interface. In vivo subcutaneous tumor study and brain glioma imaging revealed that FePt@Fe3O4 NPs can serve as a favorable T1–T2 dual-modal contrast agent. We envision that the core–shell NPs, through interface engineering, have great potential in preclinical and clinical MRI applications.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Guangyou Liu,Zhuohang Li,Zheng Lai,Zhiguang Qiu,MingYang Yang,Xinzao Wu,Zheng Zeng,Shaozhi Deng,Bo-Ru Yang
Cesium lead halide perovskite nanocrystals (PNCs) have attracted great attention in optoelectronic devices due to their excellent optical properties, such as tunable emission wavelengths, long carrier lifetime, and narrow full width at half-maximum (fwhm). However, the poor stability of PNCs in water or humid environments greatly limits their wide-spreading applications. It is challenging to prepare PNCs with long-term stability in water. Herein, we successfully prepared CsPbBr3@PDMS microspheres by using the emulsification method. Due to the protection of the PDMS layer, the CsPbBr3@PDMS microspheres exhibit good optical properties and stability in water, acid, and alkali solutions. In addition, to expand the application of CsPbBr3 NCs in flexible optical devices and wearable devices, we first prepared stretchable, stable, and photoluminescent hydrogel with a CsPbBr3@PDMS microsphere (hydrogel/CsPbBr3@PDMS) by using the emulsification method. The hydrogel/CsPbBr3@PDMS elastomer exhibits good stability and stretchability. Furthermore, the hydrogel/CsPbBr3@PDMS elastomer retains bright green emission and stability under different mechanical deformations. This work provides a method to improve the CsPbBr3 PNCs with high stability by emulsification, which could also expand the applications of PNCs in underwater display, wearable, and flexible optoelectronic devices.
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2023
·Vol. 14
·期 1
·1-12
·
IF 16.6
Liu Kai,Yang Hao,Jiang Yilan,Liu Zhaojun,Zhang Shumeng,Zhang Zhixue,Qiao Zhun,Lu Yiming,Cheng Tao,Terasaki Osamu,Zhang Qing,Gao Chuanbo
Metastable noble metal nanocrystals may exhibit distinctive catalytic properties to address the sluggish kinetics of many important processes, including the hydrogen evolution reaction under alkaline conditions for water-electrolysis hydrogen production. However, the exploration of metastable noble metal nanocrystals is still in its infancy and suffers from a lack of sufficient synthesis and electronic engineering strategies to fully stimulate their potential in catalysis. In this paper, we report a synthesis of metastable hexagonal Pt nanostructures by coherent growth on 3 d transition metal nanocrystals such as Ni without involving galvanic replacement reaction, which expands the frontier of the phase-replication synthesis. Unlike noble metal substrates, the 3 d transition metal substrate owns more crystal phases and lower cost and endows the hexagonal Pt skin with substantial compressive strains and programmable charge density, making the electronic properties particularly preferred for the alkaline hydrogen evolution reaction. The energy barriers are greatly reduced, pushing the activity to 133 mA cm geo –2 and 17.4 mA μg Pt –1 at –70 mV with 1.5 µg of Pt in 1 M KOH. Our strategy paves the way for metastable noble metal catalysts with tailored electronic properties for highly efficient and cost-effective energy conversion.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2023
·
IF 8.8
Hai Chi,Lei Wang,Shuo Wang,Guoqin Liu
A novel quench molecularly imprinted electrochemiluminescence sensor (MIECLS) based on a covalent organic framework composite (COF-300-Au) with enhanced electrochemiluminescence (ECL) signal from CsPbBr 3 quantum dots and cross-linked 3-thiopheneacetic acid functionalized AuNPs (3-TAA@AuNPs) was developed for the detection of the environmental pollutant benzo(a)pyrene (BaP). A composite material constructed of COF-300-Au with a large specific surface area served as the sensor's support substrate, providing more CsPbBr 3 and imprint recognition sites. Electropolymerization was then employed to form an AuNPs three-dimensional imprinting layer with polythiophene cross-linked using BaP as a template and 3-TAA@AuNPs as a functional monomer. A specific cross-linked imprinting recognition effect was recorded on BaP along with the quenching effect of quinones. The density functional theory (DFT) evaluation of the binding mechanism between 3-TAA@AuNPs and BaP revealed powerful MIECLS toward the detection of BaP at concentrations ranging from 10 −14 to 10 −5 M, with a detection limit of as low as 4.1 × 10 −15 M.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 10
·1655
·
IF 5.3
Duanqi Ma,Yanlin Xu,Qiuying Chen,Huafeng Ding,Xiaoming Tan,Qinfeng Xu,Chuanlu Yang
Mixed-halide perovskite quantum dots (PeQDs) are the most competitive candidates in designing solar cells and light-emitting devices (LEDs) due to their tunable bandgap and high-efficiency quantum yield. However, phase separation in mixed-halide perovskites under illumination can form rich iodine and bromine regions, which change its optical responses. Herein, we synthesize PeQDs combined with mesoporous zinc-based metal organic framework (MOF) crystals, which can greatly improve the stability of anti-anion exchange, including photo-, thermal, and long-term stabilities under illumination. This unique structure provides a solution for improving the performance of perovskite optoelectronic devices and stabilizing mixed-halide perovskite devices.Keywords:mixed-halide perovskite quantum dots;phase separation;metal organic framework
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Small
·
2023
·Vol. 19
·期 38
·2302055
·
IF 13.3
Chaojie Lyu,Yanle Li,Jiarun Cheng,Yuquan Yang,Kaili Wu,Jiwen Wu,Huichao Wang,Woon-Ming Lau,Ziqi Tian,Ning Wang,Jinlong Zheng
Heteroatoms Fe, F co-doped NiO hollow spheres (Fe, F-NiO) are designed, which simultaneously integrate promoted thermodynamics by electronic structure modulation with boosted reaction kinetics by nano-architectonics. Benefiting from the electronic structure co-regulation of Ni sites by introducing Fe and F atoms in NiO , as the rate-determined step (RDS), the Gibbs free energy of OH* intermediates (Δ G OH* ) for Fe, F-NiO catalyst is significantly decreased to 1.87 eV for oxygen evolution reaction (OER) compared with pristine NiO (2.23 eV), which reduces the energy barrier and improves the reaction activity. Besides, densities of states (DOS) result verifies the bandgap of Fe, F-NiO(100) is significantly decreased compared with pristine NiO(100), which is beneficial to promote electrons transfer efficiency in electrochemical system. Profiting by the synergistic effect, the Fe, F-NiO hollow spheres only require the overpotential of 215 mV for OER at 10 mA cm −2 and extraordinary durability under alkaline condition. The assembled Fe, F-NiO || Fe-Ni 2 P system only needs 1.51 V to reach 10 mA cm −2 , also exhibits outstanding electrocatalytic durability for continuous operation. More importantly, replacing the sluggish OER by advanced sulfion oxidation reaction (SOR) not only can realize the energy saving H 2 production and toxic substances degradation, but also bring additional economic benefits.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Licheng Yu,Youchao Wei,Yuanchao Lei,Yongsheng Liu,Maochun Hong
Inorganic cesium lead halide (CsPbX 3 , X = Cl, Br, or I) perovskite nanowires (NWs) are promising materials for investigating charge transfer and carrier dynamics at the nanoscale level. However, the synthesis of CsPbX 3 NWs with well-defined cubic phases and the desirable properties remains challenging. In this study, we successfully synthesized uniform-diameter cubic-phase CsPbBr 3 NWs with favorable properties via trace Ca 2+ doping. By combining experimental results with first-principles calculations, we confirmed that Ca 2+ doping not only induces lattice distortion in cubic-phase CsPbBr 3 nanocubes, triggering dipole moments that drive self-assembly into single-crystalline NWs via oriented attachment but also inhibits the formation of surface defects and significantly modulates the exciton relaxation kinetics by reducing nonradiative recombination, thus enhancing the photoluminescence efficiency and stability of perovskite NWs with high crystallinity . Furthermore, by exploiting the high plasticity of the CsPbX 3 lattice, we demonstrated the ability to tune the composition and emission color of the NWs through anion exchange reactions while preserving their morphology and crystal structure. These findings provide a stable platform for preparing highly efficient perovskite materials with satisfactory optoelectronic properties for use in prospective photovoltaic and optoelectronic devices.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Shuaitao Qin,Zhongjie Cui,Zhuoqi Wen,Dan Yang,Haiyang He,Jinchan Zhao,Mingliang Zhang,Shiliang Mei,Wanlu Zhang,Ruiqian Guo
Colloidal indium phosphide (InP) quantum dots (QDs) have attracted worldwide attention due to their intrinsic environmental friendliness and excellent optical properties. The incorporation of metal ions has been a common way to modify the properties of InP QDs and some metal ions have been confirmed to be effective in preparation of blue-emitting InP QDs. Herein, the interfacial anchoring effect of rare earth metal ions neodymium(III) (Nd 3+ ) is unveiled for the first time by analyzing the alteration of spectra, size, and composition of QDs after Nd doping. It is evidenced that Nd substitutes for In of InP during the process of nucleation. More crucially, Nd is anchored at the surface of InP and inhibits their further growth at the high temperature of shelling. This ensures that the size of InP QDs and the absorption peak position are almost maintained during shell growth. It is demonstrated that the emitting wavelength of InP/ZnS core/shell QDs is systematically tunable through varying Nd amounts. Finally, the optimized InP/ZnS QDs exhibiting an emission peak of 470 nm with a photoluminescence quantum yield of 44%, and a full width at half-maximum of 46 nm are prepared.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 23
·7654-7661
·
IF 6.4
Jinchan He,Xiao Zhang,Cong Xie,Hsueh Shih Chen,Ping Yang
Because of their inherent ionic properties, inorganic cesium halide lead perovskite nanocrystals (NCs) are normally unstable in light and heat environments as well as polar solvents, which seriously limit their practical application. In this paper, AlO(OH) nanosheets were assembled into hollow mesoporous spheres to encapsulate CsPbX3 NCs for increasing stability according to the powerful adsorption of AlO(OH) on Pb ions. The hollow AlO(OH) assemblies were created via hydrothermal synthesis. The in situ growth of CsPbX3 NCs in AlO(OH) assemblies was then finished in dimethylformamide solutions. After encapsulation, the stability of the NCs was greatly improved and the exchange reaction of halogen ions was effectively prevented. The NCs in the assemblies exhibited high PL quantum yields (PLQYs). Namely, blue-, green-, and red-emitting CsPbX3 (X = Cl, Br, and I)@AlO(OH) composites were fabricated. The composites were further mixed with polystyrene (PS) to prepare a flexible photoluminescent (PL) film with excellent bendable and foldable properties. The initial PLQYs of blue-, green-, and red-emitting CsPbX3@AlO(OH) composites were found to be 48.2, 96.4, and 43.7%, respectively. The films revealed high stability against water because of the excellent hydrophobic properties of PS. These emitting films were made into bands of various shapes, in which their well-flexible nature endowed the films with important applications.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Ou Hai,Jian Li,Mengkang Pei,Qiang Ren,Xiulan Wu,Bin Qin,Xinnan Xiao,Xiaoli He,Tong Li,Yang Chen
Advanced fluorescence anti-counterfeiting technology has attracted the attention of researchers and encourages people to develop more materials with more colors and functions. Here, in order to achieve a full-band afterglow in the visible light region, we designed a composite CsPbI3-CsPbBr3/Sr2MgSi2O7:Eu2+,Dy3+@SiO2, which is composed of nanoscale all-inorganic cesium lead perovskite quantum dots (PQDs) and long-afterglow luminescent materials Sr2MgSi2O7:Eu2+,Dy3+ (SMS). SMS is used to store light energy, and PQDs are used to control afterglow emission colors; through their energy transfer, the afterglow colors can be adjusted in the visible region. SiO2 is used as the coating material to improve the temporary stability of the nanocomposite. The composite mixed with oleic acid (OA) can be used as a dye, which exhibits different emitting colors and afterglow colors under different excitation environments. This research provided an idea for using long-afterglow luminescent materials and PQDs in the field of fluorescence anti-counterfeiting by double anti-counterfeiting of fluorescence and afterglow.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Chemistry
·
2023
·
IF 13.1
Di Liu,Zhejiaji Zhu,Jiani Li,Li-Wei Chen,Hui-Zi Huang,Xiao-Ting Jing,An-Xiang Yin
The application of direct ethanol fuel cell (DEFC) has been bottlenecked by the sluggish ethanol oxidation reaction (EOR). Efficient electrocatalysts for the C−C bond cleavage are essential to promote EOR with high efficiency and C1 selectivity. Here, we prepared Rh–Cu alloy nano-dendrites (RhCu NDs) with abundant surface steps through controlled co-reduction, which exhibited significantly enhanced activity and C1 selectivity (0.47 mA cm −2 (ECSA) , 472.4 mA mg Rh −1 , and 38.9%) than Rh NDs (0.32 mA cm −2 (ECSA) , 322.1 mA mg Rh −1 , and 21.4%) and commercially available Rh/C (0.18 mA cm −2 (ECSA) , 265.4 mA mg Rh −1 , and 14.9%). Theoretical calculations and CO-stripping experiments revealed that alloying with Cu could modulate the surface electronic structures of Rh to resist CO-poisoning while strengthening ethanol adsorption. In situ Fourier transform infrared spectroscopy (FTIR) indicated that the surface steps on RhCu NDs further promoted the C−C bond cleavage to increase the C1 selectivity. Therefore, optimizing the surface geometric and electronic structures of nanocrystals by rational composition and morphology control can provide a promising strategy for developing practical DEFC devices.
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS LETTERS
·
2023
·
IF 3
Caichao Wang,Yan Zhu,Kang Xu,Shuhong Sun,Mingrong Dong,Jinkun Liu,Yongmao Hu
Semiconductors Ag 8 SnS 6 (ATS) nanoparticles were synthesized by a simple one-pot method. Meanwhile, Se was added to the ATS process to form semiconductors Ag 8 SnS 6-x Se x (ATSSe) (x = 0.0, 0.2, 0.4, 0.6, 0.8) nanoparticles. The prepared ATS nanoparticles were mainly triangle in shape with grain sizes ranging from 15 ∼ 60 nm, and ATSSe nanoparticles were formed after the addition of Se during the synthesis process. Phase transformation of the synthesized nanoparticles rhombohedral crystalline ATS to cubic ATSe was observed for Se substitution ratios x in the range of 0.2 ∼ 0.8. The band gap of ATSSe nanoparticles was in the range of 1.16 ∼ 0.85 eV. This finding suggests that Se substitution is an effective method to regulate the band gap and structure of ATS.
✓ 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）