Materials
·
2025
·Vol. 18
·期 3
·487
·
IF 3.2
Duo Chen,Ruiyuan Bi,Lifeng Xun,Xiaoyan Li,Qingyu Hai,Yao Qi,Xiaopeng Zhao
Gallium-based light-emitting diodes (LEDs), including AlGaInP and GaN, have become the most widely used light-emitting devices in modern scientific research and practical applications. However, structures like carrier injection layers, active layers, and quantum well layers ensure the high luminescence efficiency of LEDs but also limit their applications at the micro- and nanoscale. Although the next generation of micrometer-scale light-emitting diodes (Micro-LEDs) has alleviated these issues to some extent, challenges such as edge effects and etching damage caused by size reduction lead to lower luminous efficiency and shorter lifetimes. Inspired by LED structure, this study designed and synthesized core–shell composite GaP:Zn/GaP/GaInP and GaP:Te/GaP nanoparticles using a thermal injection method. After high-temperature annealing, these composite materials demonstrated efficient electroluminescent performance under electric field excitation through band-edge transitions and the ZnGa-OPrecombination mechanism. Experimental results show that the GaP:Zn/GaP/GaInP-GaP:Te/GaP composite samples with doping concentrations of 15%Zn-8%Te, a core–shell precursor ratio of 1:1:1, and reaction times of 1 h:20 min:20 min exhibit the best electron–hole injection efficiency and bound-recombination efficiency. Under excitation by an external electric field, they demonstrated optimal electroluminescence performance, with a relative luminous intensity of 11,109.21 at 600 nm, approximately 15 times higher than that of the initial condition samples. In addition, this study systematically investigated the structure, morphology, and elemental composition of the composite materials using various characterization techniques, including X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and X-ray photoelectron spectroscopy (XPS). These GaP-doped nanoparticles with a core–shell composite structure, inspired by LED design, exhibited outstanding electroluminescent performance, providing new insights into the development of novel micro- and nanoscale electroluminescent materials.
研究领域:
材料科学
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纳米技术
·
光电学
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产品关联
DOI
PubMed
高影响因子
PROPELLANTS EXPLOSIVES PYROTECHNICS
·
2021
·Vol. 46
·期 8
·1216-1226
·
IF 1.887
Shuang Xu,Ai-Min Pang,Zhuo Wu,Hai-Tao Li,Wei Li,Jie Kong
Two types of bonding agents were synthesized based on polyetheramines (PEAs), which aim to increase the strain of AP/CL-20/GAP formulation. The PEAs, terminated with cyano (CTPEA) and Schiff base (SBPEA) groups, were applied in the AP/CL-20/GAP formulation, respectively. The results showed that the bonding agents TCN-403 (CTPEA) and TBA-403 (SBPEA), which were prepared from trifunctional PEA named as T-403, could significantly increase the maximum elongation ratio of the formulation. The differences between the TCN-403 and TBA-403 were analyzed by DMA of the formulations, SEM of the coated fillers, and in-situ tensile test, indicating that the Schiff base bonding agents can effectively inhibit the dewetting of the binder from the solid particles in the formulations.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
Scientific Reports
·
2024
·Vol. 14
·期 1
·1-12
·
IF 3.8
An Qi,Xie Wuxi,Li Yajin,Jian Xiaoxia,He Xu,Wang Li,Zhang Xiang,Han Peiyao
The reduction of interfacial interaction and the deterioration of processing properties of aluminum hydrides (AlH 3 ) is the main challenges preventing its practical application. Here, a simple and effective core–shell structure aluminum hydrides@polydopamine (AlH 3 @PDA) complex was constructed through in-situ polymerization. The evolution of element states on the surface of AlH 3 conducted by X-ray photoelectron spectroscopy indicated the successful introduction of PDA to form the core@shell structure, the thickness of the PDA coated layer increased with the increasing PDA dosage from 0.1 to 1.6% in mass fraction, and the maximum of thickness is 50 nm in TEM testing. Py GC/MS results proved that the increase of dopamine concentration leads to higher proportions of self-assemble units, whereas lower dopamine concentrations favor higher levels of chemical bonded components. Regarding whether PDA is a covalent polymer or a noncovalent aggregate of some species, the formation of intermediates, such as dopaminechrome and 5,6-dihydroxyindole played an important role to coordination interaction with AlH 3 in FTIR, Raman, and UV–Vis spectra testing. Compared with pure AlH 3 , the formation of organic PDA coating improved AlH 3 heat resistance. The adhesion work with GAP adhesive was also improved from 107.02 J/m 2 of pure AlH 3 to 111.13 mJ/m 2 of AlH 3 @PDA-5 complex. This paper provides well support for further practical application of AlH 3 in solid propellants.
研究领域:
材料科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2015
·Vol. 25
·期 17
·2543-2551
·
IF 11.805
Wenjin Yang,Baodan Liu,Bing Yang,Jianyu Wang,Takashi Sekiguchi,Staedler Thorsten,Xin Jiang
Bandgap engineering of semiconductor nanostructures is of significant importance either for the optical property tailoring or for the integration of functional optoelectronic devices. Here, an efficient way to control the bandgap and emission wavelength is reported for a binary compound semiconductor through alloying with another binary compound. Taking GaP-ZnSe system as an example, the bandgap of quaternary GaP-ZnSe solid-solution nanowires can be selectively tailored in the range of 1.95–2.2 eV by controlling the solubility of ZnSe dopants in GaP host. High-resolution transmission electron microscopy measurement and chemical analyses using an X-ray energy dispersive spectrometer (EDS) demonstrate the solid-solution feature of GaP-ZnSe semiconductor alloy, while X-ray photoelectron spectroscopy (XPS) characterization verifies the formation of some new chemical bonds corresponding to Zn-P and Ga-S bonds in GaP-ZnSe nanowires. The strategy to tailor the optoelectronic property of semiconductor nanostructures through the solid-solution of two different binary compounds represents a general routine to the property modification of all pseudobinary systems and will open more opportunity for their applications in electronics, optics and optoelectronics.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
Journal of Energetic Materials
·
2019
·
IF 1.649
Teng Chen,Bingwang Gou,GaZi Hao,Han Gao,Lei Xiao,Xiang Ke,Shuangfeng Guo,Wei Jiang
1, 3, 5-trinitro-1, 3, 5-triazinane/Glycidylazide polymer (RDX/GAP) energetic nanocomposites were fabricated via a facile sol-gel method. Morphologies and structure characterization of RDX/GAP energetic nanocomposites were studied by scanning electron microscopy (SEM), Raman and Fourier-transform infrared spectroscopy (FT-IR). SEM images indicated the sizes of RDX particles in RDX/GAP nanocomposites were in nanoscale. FT-IR spectra of RDX/GAP nanocomposites showed the conjunct characteristics of RDX and GAP, implying RDX particles were trapped in GAP gel matrix. Raman detection revealed the crystal form of RDX maintained original α-form during sol-gel process. The thermal kinetics and thermodynamics of RDX/GAP energetic nanocomposites were investigated by differential thermal analyzer (DTA) under various heating rates (5, 10, 15, and 20°C min−1). The kinetic and thermodynamic parameters of the energetic nanocomposites, such as activation energy (Ea), activation enthalpy (ΔH≠), activation entropy (ΔS≠), and activation Gibbs free energy of (ΔG≠) were obtained. The activation energies of RDX/GAP nanocomposites were lower than those of raw RDX and GAP-RDX mechanical mixtures, indicating RDX/GAP nanocomposites presented high thermolysis activities. The thermodynamic parameters presented a rising trend when the contents of RDX increase. The critical temperature of thermal explosion (Tb) and the self-accelerating decomposition temperature (TSADT) based on the activation energy were also obtained.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
Nanoscale Research Letters
·
2021
·Vol. 16
·期 1
·1-9
·
IF 4.703
Tian Zhenzhen,Yuan Xiaoming,Zhang Ziran,Jia Wuao,Zhou Jian,Huang Han,Meng Jianqiao,He Jun,Du Yong
Growth of high-quality III–V nanowires at a low cost for optoelectronic and electronic applications is a long-term pursuit of research. Still, controlled synthesis of III–V nanowires using chemical vapor deposition method is challenge and lack theory guidance. Here, we show the growth of InP and GaP nanowires in a large area with a high density using a vacuum chemical vapor deposition method. It is revealed that high growth temperature is required to avoid oxide formation and increase the crystal purity of InP nanowires. Introduction of a small amount of Ga into the reactor leads to the formation of GaP nanowires instead of ternary InGaP nanowires. Thermodynamic calculation within the calculation of phase diagrams (CALPHAD) approach is applied to explain this novel growth phenomenon. Composition and driving force calculations of the solidification process demonstrate that only 1 at.% of Ga in the catalyst is enough to tune the nanowire formation from InP to GaP, since GaP nucleation shows a much larger driving force. The combined thermodynamic studies together with III–V nanowire growth studies provide an excellent example to guide the nanowire growth.
研究领域:
材料科学
·
半导体物理
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纳米科技
·
热力学
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化学气相沉积
·
晶体生长
✓ 已验证
DOI
高影响因子
PROPELLANTS EXPLOSIVES PYROTECHNICS
·
2023
·Vol. 48
·期 6
·e202300022
·
IF 1.8
Ximing Zhang,Peng Jin,Wenhao Liu,Tianqi Li,Shuang Liu,Wu Yang,Cong Zhu,Mengze Zheng,Yunjun Luo
In this work, the energetic thermoplastic polymers were synthesized with different ratios of energetic prepolymer glycidyl azide (GAP) and isophorone diisocyanate (IPDI), and used as the binder to prepare fuel-rich propellants based on Al−Mg. The results showed that energetic thermoplastic polymer enabled the fuel-rich propellant a faster flame spread, greater flame strength, and a stronger injection effect of metal droplets. The weight loss (Δ m ) of the propellants increased with GAP content, while the weight loss rate ( D max ) increased similarly. The Δ m increased from 7.92 % to 9.86 % and D max from −0.23 % ⋅ °C −1 to −0.35 % ⋅ °C −1 in the range 100–256.5 °C. The propellant with the highest GAP content (85GAP-Prop) had the lowest apparent activation energy (150.77 kJ ⋅ mol −1 ). The average pressure rate of 85GAP-Prop burning in a closed bomb reached 7.67 MPa ⋅ s −1 and the maximum instantaneous pressure rate could reach 16.52 MPa ⋅ s −1 , significantly higher than the other propellants. The combustion products analysis indicated that the higher GAP content in the GAP-IPDI energetic thermoplastic polymer more significantly reduced the agglomeration of Al particles and improved the loosening of the combustion products. The rapid combustion gas generation characteristic and energy release of energetic thermoplastic polymer enhanced the combustion characteristics of the fuel-rich propellant based on Al−Mg, which promoted dispersion level between the metal droplets. This work provides insight into the combustion principles and performance improvements of fuel-rich propellant based on Al−Mg.
研究领域:
材料科学
·
燃烧与推进
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2025
·
IF 6.3
Mianji Qiu,Zhi Geng,Wangjian Cheng,Chengyuan Hua,Xing Yan,Baoyun Ye,Chongwei An,Jingyu Wang
Solid propellants are essential for rocket engine efficiency and safety. The introduction of energetic self-healing adhesives can improve its energy density, mechanical properties, and safety, while extending its service life. Therefore, this paper proposes a novel energetic self-healing adhesive that utilizes asymmetric alicyclic isophorone diisocyanate (IPDI) and 2-(aminophenyl) disulfide (2-AFD), which has a bent biphenyl ring structure, as hard segments, combined with semicrystalline polymer polycaprolactone (PCL) and energetic adhesive glycidyl azide polymer (GAP) as soft segments to synthesize a series of self-healing adhesives. By adjusting the hard segment content, a balance between mechanical properties and self-healing performance is achieved. Results show that increasing the hard segment content enhances toughness (from 26.60 MJ·m −3 to 58.54 MJ·m −3 ), but decreases self-healing efficiency (from 90 % to 58 %). GPPU-2 exhibits 38.95 MJ·m −3 toughness and recovers 86 % of its toughness within 90 min at 80 °C via dynamic disulfide and hydrogen bond interactions. The GPPU-2-based propellant, GPPU80, recovers 88.22 % of tensile strength after 24 h at 80 °C, demonstrating effective crack propagation inhibition. Compared to inert adhesive-based propellants, GPPU80 shows superior combustion performance and energy release. This study offers insights for designing high-performance self-healing adhesives to enhance propellant safety and energy density.
研究领域:
材料科学
·
航天工程
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产品关联
DOI
高影响因子
NEUROSCIENCE LETTERS
·
2020
·
IF 2.274
Ji-Duo Shen,Yue-Wen Zhang,Bao-Ying Wang,Li Bai,Shuai-Fei Lu,Lei-Lei Zhu,Ming Bai,Yu-Cheng Li,Er-Ping Xu
Growing evidence suggested that energy deficiency might be involved in the pathophysiological mechanism of depression. Energy deficiency, mainly results from mitochondrial damage, can lead to the dysfunction of synaptic neurotransmission, and further cause depressive-like behavior. The antidepressant effect of resveratrol had been widely demonstrated in previous studies; however, the underlying mechanism remains poorly understood. The present study aimed to investigate whether the antidepressant effects of resveratrol involved in the energy levels and neurotransmission in the hippocampus. We found that resveratrol and fluoxetine significantly attenuated depressive-like behaviors induced by chronic unpredictable mild stress (CUMS), which evidenced by the increased sucrose preference and the reduced immobility time in a forced swimming test. In addition, resveratrol increased hippocampal ATP levels, decreased Na + -K + -ATPase and pyruvate levels, and upregulated the levels of mitochondrial DNA (mtDNA), mRNA expression of sirtuin (SIRT)1 and peroxisome proliferator-activated receptor γ coactivator (PGC)1α. Furthermore, resveratrol and fluoxetine increased serotonin (5-HT) levels and downregulated the mRNA expression of 5-HT transporter (SERT) in the hippocampus. The decreased protein expression of growth-associated protein (GAP)-43 induced by CUMS was also ameliorated by resveratrol and fluoxetine. These findings demonstrated the antidepressant effects of resveratrol and suggested that resveratrol was able to promote mitochondrial biogenesis, enhance ATP and 5-HT levels, as well as upregulate GAP-43 expression in the hippocampus.
研究领域:
神经科学
·
药理学
·
分子生物学
·
行为科学
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产品关联
DOI
PubMed
高影响因子
MOLECULES
·
2020
·Vol. 25
·期 8
·1988
·
IF 3.267
Liming He,Jun Zhou,Yutao Wang,Zhongliang Ma,Chunlin Chen
Energetic binders are a research hot-spot, and much emphasis has been placed on their mechanical properties. In this study, propargyl-terminated ethylene oxide-tetrahydrofuran copolymer (PTPET) was synthesized. Then, PTPET and low-molecular-weight ester-terminated glycidyl azide polymer (GAP) were reacted by the click reaction without using catalysts to obtain a polyether polytriazole elastomer. Through tensile tests, where R = 0.5, the tensile strength reached 0.332 MPa, with an elongation at break of 897.1%. Swelling tests were used to measure the cross-linked network and showed that the cross-linked network regularity was reduced as R increased. The same conclusions were confirmed by dynamic mechanical analysis (DMA). In DMA curves, Tg was around −70 to −65 °C, and a small amount of crystallization appeared at between −50 and −30 °C, because locally ordered structures were also present in random copolymers, thereby forming localized crystals. Their thermal performance was tested by Differential Scanning Calorimeter (DSC) and Thermal Gravimetric Analyzer (TG), and the main mass loss occurred at around 350 to 450 °C, which meant that they were stable. In conclusion, the polyether polytriazole elastomer can be used as a binder in a composite propellant.Keywords:click chemical reaction;PTPET;GAP;polytriazole;thermo-mechanical properties
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 17
·12091-12102
·
IF 2.993
Zeng Chengcheng,Wang Jun,He Guansong,Huang Chuan,Yang Zhijian,Liu Shijun,Gong Feiyan
The application of aluminum nanoparticle is limited due to its passivation Al 2 O 3 layer even though it owns extreme specific surface and high reaction activity. In this work, the aluminum nanoparticles were modified via in situ grafting onto energetic glycidyl azide polymer (GAP) to improve the stability and energy-releasing performance. The results showed that GAP was grafted on the nano-aluminum surface with chemical bonds of –O–(CO–NH)– formed, and the thickness of shell layer of GAP could be tuned by changing the relative ratio of reactants. Furthermore, modified nanoparticles show hydrophobicity with static water contact angle changing from 20.2° to 142.4°. Significant increasing stability of aluminum nanoparticles is obtained in hot water, which is evidenced by that around 10 wt% of modified aluminum is reacted after 210 min. Based on the core–shell configurations, (Al@GAP)/fluorine composites were prepared. The violent combustion phenomenon and high release rate profiles revealed high energy-releasing performance with the assistance of GAP. This synthetic strategy may provide an effective approach to prepare other metal nanoparticles, and possess potential application value in the fields of metallized explosives and high-energy structure with energy release.
研究领域:
材料科学
·
能源化学
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产品关联
DOI
高影响因子
Nano Research
·
2023
·Vol. 16
·期 7
·8961-8969
·
IF 9.9
Cheng Lu,Wu Fengxia,Tian Yu,Lv Xiali,Li Fenghua,Xu Guobao,Hsu Hsien-Yi,Zhang Yongjun,Niu Wenxin
Plasmonic catalysis is emerging as a dynamic field in heterogeneous catalysis and holds great promise for the efficient utilization of solar energy. Central to the development of plasmonic catalysis is the design of efficient plasmonic nanocatalysts. In this report, plasmonic gap nanostructures (PGNs) on the basis of Au@poly(o-phenylenediamine) (POPD)@Pd sandwich nanostructures are synthesized as plasmonic nanocatalysts by an in-situ reduction synthetic strategy, which allows for the precise engineering of the POPD gap size between plasmonic Au and catalytic Pd components. The introduction of conducting POPD nanogap in PGNs not only effectively enhances their light harvesting capability, but also provides an effective charge transfer channel for harnessing the photogenerated hot charge carriers. In this respect, distinct gap-dependent performances in plasmon-enhanced electrocatalysis of ethanol oxidation reactions (EOR) are demonstrated with the PGN nanocatalysts and over 2.5 folds of enhancement can be achieved. A volcano plot is derived to describe the relationship between the catalytic activities and gap size of the PGN nanocatalysts, which is well explained by the interplay of their light harvesting and charge transport capabilities. These results highlight the importance of gap engineering in PGNs for plasmonic catalysis and offer the promise of developing efficient plasmonic nanocatalysts for other heterogeneous catalytic reactions.
研究领域:
材料科学
·
催化化学
·
纳米技术
✓ 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）