Nanoscale
·
2023
·Vol. 15
·期 38
·15635-15642
·
IF 6.7
Mingzhu Hu,Yumeng Wang,Shengpeng Hu,Zongpeng Wang,Bi Du,Yanjun Peng,Jiawei Yang,Yunjie Shi,Dongdong Chen,Xi Chen,Ziwen Zhuang,Zhixun Wang,Xi Chen,Jiecheng Yang,Yongshuai Ge,Eyu Wang,Quan Wen,Shuang Xiao,Ming Ma,Weimin Li,Jie Zhang,De Ning,Lei Wei,Chunlei Yang,Ming Chen
Scintillators with high spatial resolution at a low radiation dose rate are desirable for X-ray medical imaging. A low radiation dose rate can be achieved using a sufficiently thick scintillator layer to absorb the incident X-ray energy completely, however, often at the expense of low spatial resolution due to the issue of optical crosstalk of scintillation light. Therefore, to achieve high sensitivity combined with high-resolution imaging, a thick scintillator with perfect light guiding properties is in high demand. Herein, a new strategy is developed to address this issue by embedding liquid scintillators into lead-containing fiber-optical plates (FOPs, n = 1.5) via the siphon effect. The liquid scintillator is composed of perovskite quantum dots (QDs)/2,5-diphenyloxazole (PPO) and the non-polar high-refractive index (n = 1.66) solvent α-bremnaphthalene. Benefiting from the pixelated and thickness-adjustable scintillators, the proposed CsPbBr3 QDs/PPO liquid scintillator-based X-ray detector achieves a detection limit of 79.1 μGy s−1 and a spatial resolution of 4.6 lp mm−1. In addition, it displays excellent tolerance against radiation (>34 h) and shows outstanding stability under ambient conditions (>160 h). This strategy could also be applied to other liquid scintillators (such as CsPbCl3 QDs and Mn:CsPbCl3 QDs). The combination of high sensitivity, high spatial resolution and stability, easy fabrication and maintenance, and a reusable substrate matrix makes these liquid scintillators a promising candidate for practical X-ray medical imaging applications.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Chenjing Zhao,Chunrong Zhu,Yue Yu,Wenhao Xue,Xiaoyun Liu,Fang Yuan,Jinfei Dai,Shuangpeng Wang,Bo Jiao,Zhaoxin Wu
Lead halide perovskite quantum dots (QDs) have attracted great interest for application in light-emitting diodes (LEDs) due to their high photoluminescence quantum yield (PLQY), solution processability, and high color purity, showing great potential for next-generation full-color display and lighting technologies. Conventional long-chain insulating oleic acid (OA)/oleamine (OAm) ligands exhibit dynamic binding to the surface of QDs, resulting in a plethora of extra surface defects and inferior optoelectronic properties. Herein, a sole multifunctional ligand with optimized carbon chain length, that is, 2-thiophenepropylamine bromide (ThPABr), was creatively designed and introduced into CsPbBr3 QDs, which not only replaces OAm and provides a bromine source but also coordinates with the uncoordinated surface Pb2+ of QDs through the thiophene, passivating surface defects and increasing the PLQY of the film to 83%. More importantly, the interaction between the electron donor–thiophene ring and QDs can enhance electron injection and improve carrier balance. The resulting green LED exhibited significant performance improvement, showing ultrahigh spectral stability under high operating voltage, achieving a maximum external quantum efficiency of 10.5%, and extending the operating lifetime to 5-fold that of the reference. Designing a single multifunctional ligand presents a promising and convenient strategy for selecting surface ligands that can enhance the performance of LEDs or other optoelectronic devices.
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MICROCHIMICA ACTA
·
2023
·Vol. 190
·期 8
·1-8
·
IF 5.7
Huang Feng,Deng Lei,Wang Tingting,Zhang Aomei,Yang Minghui,Hou Yi
A bovine serum albumin (BSA)-assisted ultrasonication strategy was developed for the synthesis of CsPbBr 3 nanocrystals (NCs) with stable fluorescence properties in aqueous solution. Such a preparation method is simple, fast and does not require complex equipment. The results show that the synthesized CsPbBr 3 NCs are homogeneous in particle size and have good solubility and stability in water. The CsPbBr 3 NCs have been utilized as fluorescence probe for rapid detection of hydrogen sulfide (H 2 S) in human serum. The reaction of H 2 S with the lead sites on the surface of CsPbBr 3 NCs produces lead sulfide (PbS), resulting in the decrease of fluorometric intensity of CsPbBr 3 NCs. Our designed fluorescent assay has a linear S 2− detecting range of 10 ~ 800 nM with a detection limit of 7.05 nM. The assay was used to determine H 2 S in human serum with spiked recoveries ranging from 94.98% to 102.69%. This work opens new avenues for the application of halide lead perovskite in different biosensing areas. Graphical abstract
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SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Yating Zhang,Xiaoyu Zheng,Siqi Chen,Yongzhen Qiu,Fang Luo,Zuquan Weng,Bin Qiu,Jian Shou,Zhenyu Lin
Lead halide perovskites have garnered significant attention in the field of photoelectrochemistry due to their outstanding optical properties . Nevertheless, the pronounced susceptibility of perovskite to water poses a major limitation to its practical applications. A signal-on photoelectrochemical (PEC) sensor was constructed in this work using water-resistant perovskite nanocrystals for the detection of hydrogen sulfide . Specially, the electrode surface was modified with composite nanomaterials (CsPbBr 3 @PEG-PCL). In the presence of H 2 S, efficient heterojunctions were formed through the in-situ generation of PbS on CsPbBr 3 @PEG-PCL, thereby enhancing the photocurrent signal. The potential mechanism behind this signal enhancement was extensively discussed. The designed sensor exhibited a linear relationship with the concentration of H 2 S ranging from 0.02 to 120 μM, with a detection limit of 6.67 nM. This work opens up new possibilities for utilizing halide perovskites in the field of sensing, with promising applications in areas such as food safety, environmental monitoring, and biomedical analysis.
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Materials
·
2023
·Vol. 16
·期 24
·7585
·
IF 3.4
Xianghua Wang,Lin Zhou,Xudong Zhao,Wenlong Ma,Xinjun Wang
In this study, all-inorganic perovskite quantum dots (QDs) for pure blue emission are explored for full-color displays. We prepared CsPbBr3and Cs3NdCl6QDs via hot injection methods and mixed in various ratios at room temperature for color blending. Nd-doped CsPb(Cl/Br)3QDs showed a blueshift in emission, and the photoluminescence quantum yields (PLQY, ΦPL) were lower in the 460–470 nm range due to surface halogen and Cs vacancies. To address this, we introduced a silane molecule, APTMS, via a ligand exchange process, effectively repairing these vacancies and enhancing Nd doping into the lattice. This modification promotes the PLQY to 94% at 466 nm. Furthermore, combining these QDs with [1]Benzothieno[3,2-b][1]benzothiophene (BTBT), a conjugated small-molecule semiconductor, in a composite film reduced PLQY loss caused by FRET in solid-state QD films. This approach achieved a wide color gamut of 124% National Television System Committee (NTSC), using a UV LED backlight and RGB perovskite QDs in a BTBT-based organic matrix as the color conversion layer. Significantly, the photostability of this composite was enhanced when used as a color conversion layer (CCL) under blue-LED excitation.Keywords:exciton;quantum dots;exciton binding energy;zeta potential;Förster resonance energy transfer;nanostrain;color conversion layer
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Materials Today Chemistry
·
2023
·
IF 7.3
Hu Shen,Song Zhang,Mengqi Jin,Rong Liu,Dong Yang,Xin Zhou,Shengmin Wang,Zhitao Shen,Ying Liu,Fumin Li,Huilin Li,Ruirui Cao,Chong Chen
Cadmium selenide (CdSe) quantum dots (QDs) as functional interface layer have been used to improve the performances of perovskite solar cells (PSCs). However, the optimization of PSCs by CdSe QDs has some challenges of inferior performances for charge transportation, and interface defects, which are not conducive to the development of power conversion efficiency (PCE). Here, sodium thiosulfate capped CdSe QDs (S 2 O 3 2- -CdSe QDs) are prepared as interface modifiers to improve the performances of PSCs. The S 2 O 3 2- -CdSe QDs can effectively passivate defects and reduce interfacial nonradiative recombination, Moreover, the S 2 O 3 2- -CdSe QDs regulate the energy level of perovskite film. In addition, the S 2 O 3 2- -CdSe QDs form an interface layer to increase moisture resistance and improve the stability of PSCs. As a result, the devices with S 2 O 3 2- -CdSe QDs show an improved power conversion efficiency (PCE) of 22.57 %. Meanwhile, the stabilities of the unencapsulated device with S 2 O 3 2- -CdSe QDs under 25 °C with a humidity of 30 %–40 %, and 85 °C in N 2 heat both perform better than the control devices.
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Materials Today Chemistry
·
2023
·
IF 7.3
C.-H. Sun,X.-Q. Li,T.-M. Zhu,H.-Y. Yu,Y.-M. Liang,Y.-H. Sun,J.-M. Nan
SnS is a promising anode material for sodium-ion batteries (SIBs) due to its high theoretical specific capacity, but the poor intrinsic conductivity, bulk expansion and shuttle effects brought by polysulfides seriously limit its practical use. Here, soft/rigid SnS&TiS 2 compounds with carbon nanotubes (ST@CNTs) is designed to overcome the shortcomings. The rigid TiS 2 , as the strong backbone of SnS&TiS 2 , relieves the expansion stress caused by SnS after sodiation, together with CNTs improve the materials conductivity. TiS 2 generates many sulfur defects under the synergistic effect of SnS, which can regulate the sodium-ion embedding sites to stabilize the compound structure and decrease the sodium-ion diffusion energy barrier. Moreover, rigid TiS 2 can adsorb polysulfides induced by SnS, thus suppresses the shuttle effect and improves the cycling and rate performances. Fortunately, the above conclusions are confirmed by the DFT calculations. The ST@CNTs provide a specific capacity of 550 mAh/g at 1.0 A/g after 300 cycles, and a high-rate capability of 443 mAh/g at 2.0 A/g. This soft/rigid misfit strategy combines the advantages of high modulus of rigid layers and high sodium-ion storage capacity of soft layers, which gives an idea for the development of new anode candidates for SIBs.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 21
·1-10
·
IF 2.8
Yu Hongquan,Gao Xiao,Huang Chenchen,Liu Shimin,Chen Baojiu,Xu Sai,Zhang Yong,Zhao Hong
CsPbCl 3 and Mn:CsPbCl 3 nanocubes/nanorods were prepared by a hot injection technique. The crystal structure, size and morphology of the CsPbCl 3 and Mn:CsPbCl 3 samples were measured by X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The edgelengths of the nanocubes and the length and width of the nanorods of CsPbCl 3 are between tens and hundreds of nanometers. The size and morphology of Mn:CsPbCl 3 are similar to those of CsPbCl 3 . The introduction of Mn 2+ ions led to little change in the CsPbCl 3 host structure. Their electrochemical properties for LIB application were tested by cyclic voltammetry, galvanostatic charge–discharge and electrochemical impedance spectroscopy. The introduction of a small amount of Mn 2+ ions can improve the structural stability of CsPbCl 3 during charge–discharge cycles because the Mn 2+ part replaces the Pb 2+ ions of CsPbCl 3 . Thus, Mn:CsPbCl 3 shows high discharge specific capacities, excellent cyclic performance, and lower electrochemical impedance values than CsPbCl 3 in LIB applications.
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Science China-Materials
·
2023
·Vol. 66
·期 9
·3696-3705
·
IF 8.1
Wang Yang,Gao Feng,Zhou Shuai,Hu Po,Fu Jiajun
Lanthanide-doped upconversion nanoparticles (UCNPs) have been extensively investigated owing to their unique advantages. So far, the most favored modality of UCNPs is still the classical Yb–A (where A refers to Er 3+ , Tm 3+ , and Ho 3+ )-coupled nanosystems under 980-nm excitation. However, the frequently used Yb 3+ ion with the single-excited 2 F 5/2 state can barely transfer energy to other acceptors owing to its lack of matched excited levels. Herein, a novel strategy is proposed for energy transfer via Ho 3+ as a bridge ion coupling donor-acceptor pairs (e.g., Yb 3+ –Nd 3+ ), where little direct energy transfer occurs, and the involved energy transport mechanisms are investigated. The findings reveal that long-distance energy transportation can occur in the Ho 3+ sublattice owing to the energy migration capability of Ho 3+ and that Ho 3+ as a bridge ion can realize interparticle energy transfer for upconversion luminescence. Moreover, well-designed NaYbF 4 :40%Ho@NaYF 4 :10%Nd core-shell nanoparticles with multimode responsiveness can emit different colored lights under varying excitation wavelengths, which are demonstrated in high-level anticounterfeiting and information identification. Therefore, this work paves a new way to understand the functionality of the Ho 3+ bridge in energy transfer upconversion and offers strategies for broadening energy transfer pathways and finely manipulating photon upconversion.
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Shiwei Xue,Hengbin Mao,Junhui Li,Xinge Sun,Ziyu Gong,Bingbing Fan,Gang Shao,Hailong Wang,Hongliang Xu,Rui Zhang,Hongxia Lu
All-inorganic lead halide perovskite nanocrystals (NCs) have attracted considerable attention in field of optoelectronics due to their excellent properties such as high PLQY , tunable emission spectra in visible light region, and narrow emission peaks. However, problems existing in the research of all-inorganic lead halide perovskite materials are high lead content, low stability, and complex synthesis processes. Those problems need to be solved urgently. Therefore, dual-phase Cs‘B’Br 3 /Cs‘B’ 2 Br 5 perovskite material (Cs(Pb 1/5 Mn 1/5 Ni 1/5 Zn 1/5 Cd 1/5 )Br 3 /Cs(Pb 1/5 Mn 1/5 Ni 1/5 Zn 1/5 Cd 1/5 ) 2 Br 5 ) was synthesized by doping the B-site of CsPbBr 3 and CsPb 2 Br 5 using high-energy ball milling in this thesis. This dual-phase perovskite material has maximum absorption edge of 540 nm, a band gap width of 2.22 eV, the maximum emission peak at 600 nm with FWHM of 72 nm, PLQY of 24.50%, and an average fluorescence lifetime of 227.87 μs. After 21 days at room temperature, luminescent intensity of NCs increased to 156%, and still retained 109% at 120 days. After treatment at 150 °C, luminescent intensity decreased to 47%. Results show that this high-entropy dual-phase perovskite has great stability in different temperature. This proves that synthesis of high-entropy dual-phase halide perovskite by high-energy ball milling is feasible, and has great significance in solving poor stability and high lead content of all-inorganic lead halide perovskite in the future.
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ACS Nano
·
2023
·
IF 17.1
Minxia Zhu,Luwen Zhu,Yuchan You,Mingchen Sun,Feiyang Jin,Yanling Song,Jucong Zhang,Xiaoling Xu,Jiansong Ji,Yongzhong Du
Tumor interstitial pressure represents the greatest barrier against drug diffusion into the depth of the tumor. Biometric nanomotors highlight the possibility of enhanced deep penetration and improve cellular uptake. However, control of their directionality remains difficult to achieve. Herein, we report cysteine-arginine-glutamic acid-lysine-alanine (CREKA)-modified ceria@polydopamine nanobowls as tumor microenvironment-fueled nanoscale motors for positive chemotaxis into the tumor depth or toward tumor cells. Upon laser irradiation, this nanoswimmer rapidly depletes the tumor microenvironment-specific hydrogen peroxide (H2O2) in the nanobowl, contributing to a self-generated gradient and subsequently propulsion (9.5 μm/s at 46 °C). Moreover, the asymmetrical modification of CREKA on nanobowls could automatically reconfigure the motion direction toward tumor depth or tumor cells in response to receptor–ligand interaction, leading to a deep penetration (70 μm in multicellular spheroids) and enhanced antitumor effects over conventional nanomedicine-induced chemo-photothermal therapy (tumor growth inhibition rate: 84.2% versus 56.9%). Thus, controlling the direction of nanomotors holds considerable potential for improved antitumor responses, especially in solid tumors with high tumor interstitial pressure.
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TRIBOLOGY INTERNATIONAL
·
2023
·
IF 6.2
Qiang Tang,Qing-Yun Wu,Lin Gu
Graphene oxide (GO) nanocomposite lubricants have been verified with excellent anti−wear and anti−friction properties. However, the rapid transfer of hydrophilic GO nanosheets into hydrophobic lubricants still faces great challenges. In this work, a series of nanocomposite lubricants were successfully fabricated by a simple phase transfer process without complex chemical modification. With the assistance of ethanol and oleylamine, the GO nanosheets initially dispersed in the water phase could be quickly transferred to the mineral oil within 20 s after hand-shaking the immiscible two−phase system. Moreover, the phase−transferred GO nanosheets were greatly stable in the mineral oil for at least seven days. The tribological properties of the GO nanocomposite lubricants had been studied by a macroscopic ball−on−disk friction test. The tribological behavior of the obtained nanocomposite lubricants showed that when 0.1 mg/mL GO was dispersed into mineral oil, the minimum average friction coefficient was 0.140, which was 72% lower than that of mineral oil. The universality of the phase transfer process was verified by the reduced GO nanosheets. This physical phase transfer method must be simple, effective, and environment−friendly to prepare nanocomposite lubricants.
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