Advanced Optical Materials
·
2023
·
IF 9
Ying Lv,Yunkai Li,Zhongyuan Li,Rong-Jun Xie
Near-infrared (NIR) luminescent materials hold promising applications in NIR spectroscopy technologies, but the NIR emitters are largely limited to some transition metals with spin-forbidden transitions that lead to low absorption efficiency of the pumping light. Exploring novel efficient NIR emitters is thus an urgent and challenging task for developing high-efficiency NIR luminescent materials. Here, an interesting NIR emission of Sm 2+ is reported in BaAlSi 5 O 2 N 7 , which exhibits both a line spectrum at 682 nm and a broadband centered at 778 nm with a full-width at half maximum (FWHM) of 141 nm. Temperature-dependent photoluminescence spectra and decay curves evidence that the thermally assisted electrons crossover (TAEC) process contributes to the enhancement of the broadband NIR emission. The fabricated NIR phosphor-converted light-emitting diode (pc-LED) shows promising potential as a NIR lighting source and proves robust thermal stability under high-temperature aging test. The present surprising NIR emission from Sm 2+ in highly stable oxynitrides opens a way to explore efficient and reliable NIR phosphors that are suitable for commercial LED chips.
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NATURE MATERIALS
·
2023
·
IF 41.2
Huang Xiaoyan,Zhang Shuai,Zhang Pei,Zhu Yujie,Xie Jiaye,Yang Mingcong,Han Lu,Hu Jun,Li Qi,He Jinliang
Dielectric polymers are ubiquitous as electrical insulation in electronic devices and electrical systems. Electrical degradation of dielectric polymers tends to initiate catastrophic failure of numerous devices and systems, but its detection and early warning remain challenging. Here we report a general material strategy that signals the electrical degradation of dielectric polymers by autonomously presenting a visually discernible warning in the form of a pronounced colour change. This colour change is induced by the chromogenic response of molecular indicators blended with the polymer, which are chemically activated by the oxygen radicals generated in situ during the electrical degradation of the polymer. We unveil that the structural degradation and electrical properties of the dielectric polymer are quantitatively correlated with the colour difference. Such a chromogenic process is autonomous without the need of human intervention or other external energy, thus offering the convenience to lower or even eliminate the risk of dielectric failure.
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npj Quantum Materials
·
2023
·Vol. 8
·期 1
·1-7
·
IF 5.7
Xu R. Z.,Du X.,Zhou J. S.,Gu X.,Zhang Q. Q.,Li Y. D.,Zhao W. X.,Zheng F. W.,Arita M.,Shimada K.,Kim T. K.,Cacho C.,Guo Y. F.,Liu Z. K.,Chen Y. L.,Yang L. X.
TaTe 4 , a metallic charge-density wave (CDW) material discovered decades ago, has attracted renewed attention due to its rich interesting properties, such as pressure-induced superconductivity and candidate nontrivial topological phase. Here, using high-resolution angle-resolved photoemission spectroscopy and ab initio calculation, we systematically investigate the electronic structure of TaTe 4 . At 26 K, we observe a CDW gap as large as 290 meV, which persists up to 500 K. The CDW-modulated band structure shows a complex reconstruction that closely correlates with the lattice distortion. Inside the CDW gap, there exist highly dispersive energy bands contributing to the remnant Fermi surface and metallic behavior in the CDW state. Interestingly, our ab initio calculation reveals that the large CDW gap mainly opens in the electronic states with out-of-plane orbital components, while the in-gap metallic states originate from in-plane orbitals, suggesting an orbital texture that couples with the CDW order. Our results shed light on the interplay between electron, lattice, and orbital in quasi-one-dimensional CDW materials.
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Lan Zheng,Heng Ma,Yaohong Ma,Qingjun Meng,Junhui Yang,Binglian Wang,Yan Yang,Weili Gong,Guangheng Gao
In this work, we developed a highly sensitive electrochemical enzyme electrode that directly determines the uric acid (UA) concentration in urine. Results from cyclic voltammetry testing showed a well-defined oxidation peak at 0.35 V, but no reduction peak, indicating that an irreversible redox reaction was executed. The enzyme electrode’s modification method was optimized as follows: 0.1% chitosan, 0.3% graphene oxide, 5 mmol L -1 uricase, and 25% glutaraldehyde. Under these optimal conditions, there was a good linear relationship between the redox peak current and UA concentration in the range of 0.1-2 mmol L -1 (I=4.1661 CUA + 2.0445; R 2 =0.9995); and the detection limit was 0.023 mmol L -1 (S/N = 3.3). The modified electrode showed high repeatability (RSD = 3.34%), good stability (12 days), and strong antiinterference capability. Therefore, this electrode can quickly and accurately determine the UA concentration in urine. This study is highly significant for monitoring UA levels in gout populations and preventing kidney damage caused by gout.
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CHEMPHYSCHEM
·
2023
·Vol. 24
·期 17
·e202300187
·
IF 2.9
Aleksandr Aglikov,Olga Volkova,Anna Bondar,Ivan Moskalenko,Alexander Novikov,Ekaterina V. Skorb,Evgeny Smirnov
Graphical MXene flakes were incorporated into polyelectrolyte multilayers and used as active media for memristive devices. The memristors were produced by layer-by-layer assembly through dipping into the corresponding solutions. The current difference between high and low resistive state were measured as two orders of magnitude. DFT calculations were applied to rationalize the observations. The emerging novel class of two-dimensional materials – MХenes – have attracted significant research attention. However, there are only few reports on using the most prominent member of the MXene family, Ti 3 C 2 T x , as an active material for memristive devices within a polyelectrolyte matrix and its deposition on inert electrodes like ITO and Pt. In this study, we systematically investigate Ti 3 C 2 T x MXenes synthesized with two classical delamination agents, such as lithium chloride and tetramethylammonium hydroxide, to identify the most suitable candidate for memristive device applications. The characteristics of memristors based on the hybrid structures consisting of MXene−polyelectrolyte multilayers, specifically polyethyleneimine (PEI) and poly(sodium 4-styrenesulfonate) (PSS) are explored. The PEI(MXene)/PSS memristor exhibits a voltage threshold (V SET/RESET ) range of 1.5–2.0 V, enabling the transition from a high-resistive state (HRS) to a low-resistive state (LRS), along with a significant current switching ratio of approximately two orders of magnitude. The observed V SET/RESET difference of approximately 4 V is further supported by density functional theory (DFT) calculated redox potential. These findings underscore the potential of polyelectrolyte-based memristors, such as the in PEI−Ti 3 C 2 T x −PSS system, in facilitating the development of highly functional, self-assembled memristive devices with diverse applications.
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ACTA MATERIALIA
·
2023
·
IF 9.4
Xuan Ge,Pingsheng Lai,Caijuan Shi,Xiaowei Xu,Jian Wang,Tao Du,Morten M. Smedskjær,Dongliang Yang,Fan Yang,Wenquan Lu,Jingyu Qin,Jianguo Li,Qiaodan Hu
Annealed titanate glasses are important candidate materials for high-performance electronic components, but their structural response to temperature-induced properties upon thermal annealing remains elusive. Here, using high-energy synchrotron X-ray scattering, high-temperature Raman spectroscopy , and empirical potential structure refinement simulation, we track the structural evolution in situ of a barium dititanate (BaTi 2 O 5 ) glass upon annealing around and below the glass transition temperature . We find that the network structure is intrinsically floppy, as the network units ([TiO m ] polyhedra) themselves and their topological packing can be easily modulated by annealing temperature. The floppy nature of the glassy titanate network challenges the currently well-cognized Rigid-Unit Mode model explaining temperature-driven structural reorganization of prototypical network glasses (e.g., silicate/borate glasses). As temperature increases, the floppy network of BaTi 2 O 5 glass undergoes a non-monotonic, two-stage network rearrangement. After cooling back to room temperature, the distortion of network units is found recoverable whereas the change of network connectivity in the intermedium-range order is irreversible. Simulation ensembles further show the irreversible connectivity change can be ascribed to the local development of crystal-like cationic motifs, which in turn induce excess enthalpy relaxation . Our findings provide an atomic-scale perspective on temperature-dependent structural and enthalpy relaxation of a model titanate glass upon annealing, which are crucial for understanding thermal-related changes in the properties of titanate glasses.
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Journal of Materials Chemistry B
·
2018
·Vol. 6
·期 44
·7230-7238
·
IF 4.776
Echuan Tan,Jia Lv,Jingjing Hu,Wanwan Shen,Hui Wang,Yiyun Cheng
Fluoropolymers have shown great promise in non-viral gene delivery. The current fluoropolymers developed for gene delivery are synthesized by grafting fluoroalkyls or fluoroaromatics onto cationic polymers. To expand the family of fluoropolymers for the transduction of nucleic acids, new strategies to synthesize fluoropolymers are required. In this study, we synthesized both statistical and block copolymers of poly(2-dimethylaminoethyl methacrylate) (pDMAEMA) and poly(heptafluorobutyl methacrylate) (pHFMA) via reversible addition–fragmentation chain transfer polymerization, and the transfection efficiencies of the fluorocopolymers were evaluated. The statistical fluorocopolymer exhibited dramatically higher performance in gene delivery than the block one, which is attributed to more efficient and sustained DNA uptake by the transfected cells. Moreover, the statistical copolymer of DMAEMA and HFMA showed a fluorine effect in gene delivery, and its efficiency was much superior to non-fluorinated polymers. The results revealed the structure and activity relationships of fluoropolymers consisting of DMAEMA and HFMA, and provided a new insight to guide the design of fluoropolymers for efficient gene delivery.
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Nanomaterials
·
2018
·Vol. 8
·期 7
·519
·
IF 3.504
Wenjing Huang,Yuta Sunami,Hiroshi Kimura,Sheng Zhang
Several types of nanosheets, such as graphene oxide (GO) nanosheet, molybdenum disulfide (MoS2) and poly(l-lactic acid) (PLLA) nanosheets, have been developed and applied in vitro in cellular research over the past decade. Scientists have used nanosheet properties, such as ease of modification and flexibility, to develop new cell/protein sensing/imaging techniques and achieve regulation of specific cell functions. This review is divided into three main parts based on the application being examined: nanosheets as a substrate, nanosheets as a sensitive surface, and nanosheets in regenerative medicine. Furthermore, the applications of nanosheets are discussed, with two subsections in each section, based on their effects on cells and molecules. Finally, the application prospects of nanosheets in cellular research are summarized.Keywords:nanosheet;cell adhesion;drug delivery;cell capturing;regenerative medicine
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Cell Death & Disease
·
2018
·Vol. 9
·期 8
·1-20
·
IF 5.638
Yang Qin,Zheng Fangshuo,Hu Yida,Yang Yi,Li Yun,Chen Guojun,Wang Wei,He Miaoqing,Zhou Ruijiao,Ma Yuanlin,Xu Demei,Tian Xin,Gao Xiaoya,Wang Qing,Wang Xuefeng
Epilepsy is one of the most prevalent and drug-refractory neurological disorders. Zinc finger DHHC-type containing 8 (ZDHHC8) is a putative palmitoyltransferase that is highly expressed in the brain. However, the impact of ZDHHC8 on seizures remains unclear. We aimed to explore the association of ZDHHC8 with epilepsy and investigate its in epileptogenesis in in vivo and in vitro models through behavioral, electrophysiological, and pathological studies. We used kainic acid- and pilocarpine-induced C57BL/6 mice and magnesium-free-induced pyramidal neurons as experimental epileptic models in this study. We first found increased ZDHHC8 expression in the brains of temporal lobe epilepsy (TLE) patients, similar to that observed in chronic epileptic mice, strongly suggesting that ZDHHC8 is correlated with human epilepsy. In the in vitro seizure models, knocking down ZDHHC8 using recombinant adeno-associated virus (rAAV) delayed seizure precipitation and decreased chronic spontaneous recurrent seizures (SRSs) and epileptiform-like discharges, while ZDHHC8 overexpression had the opposite effect. ZDHHC8 levels were consistent with seizure susceptibility in induced mice with SRSs. In an in vitro magnesium-free model, neuronal hyperexcitability and hypersynchrony were reduced in ZDHHC8-knockdown neurons but were increased in ZDHHC8-overexpressing neurons. To further explore the potential mechanisms, we observed that ZDHHC8 had a significant modulatory effect on 2-amino-3-(5-methyl-3-oxo-1,2-oxazol-4-yl) propanoic acid (AMPA) receptor-related excitatory, but not inhibitory, glutamatergic synaptic neurotransmission, further affecting the inward rectification of AMPA currents in acute hippocampal slices in whole-cell recordings. ZDHHC8 facilitated GluA1 trafficking to the neuronal surface in the hippocampus, as shown by immunoprecipitation and Western blotting. These results suggest that ZDHHC8 may promote the generation and propagation of seizures in humans and that knocking down ZDHHC8 might produce anti-epileptogenic effects in drug-resistant epilepsy. Our study provides evidence that may facilitate the development of an alternative approach for the treatment of epilepsy by modulating AMPA/GluA1-mediated neurotransmission.
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RSC Advances
·
2018
·Vol. 8
·期 24
·13148-13153
·
IF 2.936
Man Zhao,He Xiao,Shuai Chen,Tianjun Hu,Jianfeng Jia,Haishun Wu
Improving the ferromagnetism properties of pure carbon-based materials is extremely important for their application in spintronics. Hydrogenation of graphene is an effective way to induce magnetic moment into graphene with the advantage of reversibility. However, little experimental work has been done to prove the effect of hydrogen on the magnetic properties of graphene so far, except for systems containing a large amount of oxygen or plasma-induced vacancy which complicated the magnetic origin. Here we report a facile electrochemical cathodic method to generate hydrogenated multilayer graphene or few-layer graphite using graphite powder as the raw material, and observed hydrogen-induced ferromagnetism in samples annealed at different temperatures. The observed results suggest that ferromagnetism of hydrogenated multilayer graphene can be tuned by high temperature treatment, which is attributed to a changeable relative amount of hydrogen atoms chemisorpted on two different sublattices during thermal treatment.
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JOURNAL OF SOLUTION CHEMISTRY
·
2018
·Vol. 47
·期 4
·705-714
·
IF 1.401
Li Qiang,Liu Bijun,Mu Wanjun,Yu Qianhong,Tian Yin,Liu Guoping,Yang Yuchuan,Li Xingliang,Luo Shunzhong
Glufosinate, an analogue of glutamic acid (also known as phosphinothricin), is an important herbicide. The protonation constants of glufosinate were determined by means of potentiometric titrations at variable temperatures with ionic strength 0.5 mol·L −1 (NaCl solution). The heat effects of the protonation reactions of glufosinate were measured by direct calorimetry. NMR spectroscopies have demonstrated that the first protonation site occurs on the nitrogen atom in the amino group, followed by one of the oxygen atoms in the phosphono group, and finally the carboxyl oxygen atom. This trend is in good agreement with the enthalpy of protonation and crystal structure results. These data will help to predict the speciation of glufosinate in physiological systems.
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2019
·Vol. 21
·期 32
·17801-17810
·
IF 3.567
Qiushi Song,Zheng Zhang,Hongwei Xie,Huayi Yin,Zhiqiang Ning
The carbonization of transition metals in molten salts was performed to study the effect of electrochemical polarization and molten salt medium on the carbonization process. The carbonization of niobium (Nb) has been systemically investigated in Ar atmosphere and molten salts. The effect of particle size and structure of the starting materials, molten salt medium, and electric field on the formation of NbC was studied to reveal the dynamic barriers in the carbonization process. A native oxide layer and/or niobate derivatives generated on the Nb particles are the main barriers for the mass transfer of carbon and Nb towards each other. The results showed that molten salts can accelerate the formation of NbC by enhancing the diffusion of carbon, and the kinetic barrier can be effectively eliminated by supplying negative polarization to the cathode in molten salts to remove the oxide barriers, thereby enhancing carbonization. Besides Nb, tungsten (W), molybdenum (Mo), titanium (Ti), and tantalum (Ta) can also be carbonized in molten salts with the assistance of an applied electric field.
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