NANOTECHNOLOGY
·
2018
·Vol. 30
·期 7
·075704
·
IF 3.404
Weiwei Chen,Xiaosheng Tang,Zhigang Zang,Yue Shi,Zhaoqi Yang,Juan Du
Doping of Mn2+ into semiconductor nanocrystals has been demonstrated to endow them with novel electronic, optical and magnetic functionalities. In this paper, Mn-doped CsPbX3 (X = Br, Cl) quantum dots (QDs) were synthesized at room temperature via a facile strategy by introducing dimethyl sulfoxide (DMSO)-MnBr2/PbX2 composite as a precursor. The excitonic emission spectra of the as-obtained Mn-doped CsPbX3 QDs can be tuned from 517 nm to 418 nm by adjusting the ratio of PbBr2/PbCl2 precisely, and the luminescence mechanism of the doped QDs is discussed in detail. Moreover, the highest photoluminescence quantum yield of the Mn2+ emission achieves 36.7%, which is comparable with QDs prepared by the conventional hot-injection method. Depending on the ratios of PbPb2/PbCl2, the energy transfer rate from the band-edge to Mn2+ excited state is in the range of 0.006–20.42 × 107 s−1. Furthermore, white light-emitting diodes (LEDs) were successfully fabricated by combining the as-prepared Mn-doped CsPbX3 QDs with commercial UV GaN chips, and the high luminous efficiency of the as-prepared white LEDs was developed to 55.9 lm W−1. This work strongly supports the fact that Mn-doped CsPbX3 QDs are promising materials for application in lighting and displaying fields.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2013
·
IF 3.172
Guangfang Li,Fan Qin,Runming Wang,Shengqiang Xiao,Hongzhe Sun,Rong Chen
A facile microwave irradiation method has been successfully developed for the controllable fabrication of BiOX (X = Cl, Br, I) nanostructures in mannitol solution. The morphology and size of BiOX nanostructures could be readily tailored by adjusting the amount of halide, reaction precursor, and mannitol concentration. Mannitol molecule acts as both a capping agent and a cohesive agent in the formation of BiOX nanostructures. A possible two-stage formation mechanism was discussed based on the morphology evolution of BiOI nanostructures obtained in mannitol solution with different concentrations. The as-synthesized BiOX nanostructures exhibit much higher photocatalytic activities than that of commercial TiO 2 . In particular, flower-like BiOX hierarchical nanostructures display the best photocatalytic performance, which is mainly ascribed to their unique hierarchical structure, high BET surface area, and large band gap. Moreover, BiOX nanostructures also demonstrate superior Cr(VI) removal capacity. The Cr(VI) adsorption behavior was also analyzed by the Langmuir and Freundlich adsorption isotherms.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2024
·
IF 3
Zou Yanyan,Pau Dennis,Yi Linlin,Li Yaoqiang,Li Kaiyuan
13X zeolite–calcium oxide (CaO) composite capture agent application in the pyrolysis recovery of polyvinyl chloride (PVC)-based waste cables was investigated in this research to elucidate the agent’s efficiency in capturing chlorine (Cl) and carbon (C) during pyrolysis. The 13X zeolite–CaO mixture is subjected to separate pyrolysis of the PVC-based cable outer sheath in experimental furnaces of simulated solar-powered and thermogravimetry. Subsequently, a range of spectroscopic techniques are employed to quantitatively analyze the gaseous and solid products resulting from the pyrolysis process. Through X-ray fluorescence, total carbon, and other analyses, the research outcomes demonstrated that the capture agent exhibits superior Cl and C capture performance compared to using a single agent for plastic pyrolysis. The yield of Cl element in the solid residue has increased significantly by 130–140% under the presence of optimized composite capture agent. By determining the dynamic changes of gaseous and solid products during the cable outer sheath pyrolysis, the influence of the capture agent on the redistribution and transformation mechanisms of Cl and C elements was identified, and it was found that contaminating volatiles were well immobilized in the solid residue. This research provides a new solution for efficient Cl and C capture in the pyrolysis recovery of waste cables and determines the fixation and transformation mechanisms of Cl and C elements by the composite capture agent, indicating a potential for feasible and sustainable resource utilization of waste cables.
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Yongfeng Liu,Yupeng Ying,Qingyu Xie,Zhaoju Gao,Xiuwen Shao,Min Zhou,Wei Pei,Xiaosheng Tang,Yusong Tu
Mixed-halide CsPb(Br/Cl)3 perovskite quantum dots (PeQDs) have attracted extensive attention in light-emitting diodes (LEDs), but their low photoluminescent efficiency and especially poor stability impede their practical applications. Here, we employ bifunctional didodecyldimethylammonium thiocyanide (DDASCN) with a pseudohalogen SCN– and branched DDA+ to obtain blue-emitting CsPbBr2Cl PeQDs. DDASCN significantly boosts the photoluminescence quantum yield to 92% by inhibiting nonradiative recombination. Importantly, DDASCN PeQDs show excellent stabilities against air, UV light, heat, and polar solvents. These improved performances were explained by density functional theory calculation, which shows that SCN– fills the Cl– vacancy by simultaneously binding with undercoordinated Pb2+ and Cs+, while DDA+ connects undercoordinated Br– and lies parallel to the PeQD core, leading to efficient passivation and a strong binding capacity. Finally, we achieved high-performance white LEDs by integrating our PeQDs, resulting in a color-rendering index of 92.9, a color gamut of 119.61%, and chromaticity coordinates of (0.33, 0.33). This provides an effective method to obtain efficient and stable CsPb(Br/Cl)3 PeQDs for practical applications.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Catalysis Science & Technology
·
2022
·Vol. 12
·期 22
·6687-6703
·
IF 6.177
Furong Cao,Yun Wang,Xing Wang,Wenjuan Zhang,Gregory A. Solan,Rui Wang,Yanping Ma,Xiang Hao,Wen-Hua Sun
Five types of N-(2-(diphenylphosphino)ethyl)-2-R-5,6,7,8-tetrahydroquinolin-8-amines (R = H L1, Me L2, iPr L3, Cl L4, Ph L5) along with one example of an N-isopropyl-5,6,7,8-tetrahydroquinolin-8-amine (L6) have been prepared and employed as neutral ligand supports for zinc(II) chloride complexes, LZnCl2 (Zn1–Zn6). All zinc compounds were characterized by multinuclear NMR spectroscopy (1H/13C/31P) and elemental analysis, while the structures of Zn2 and Zn5 were further studied by single crystal X-ray diffraction: distorted tetrahedral geometries with the diphenylphosphine moieties non-coordinated were a feature. Pre-treatment of Zn1–Zn5 with two equivalents of either LiCH2SiMe3 or LiN(SiMe3)2 led to catalysts displaying good to exceptionally high activity for the ring opening polymerization (ROP) of ε-caprolactone (ε-CL) at 50 °C. For example, Zn4/2LiCH2SiMe3 displayed a TOF of 2.1 × 104 h−1 with 71% conversion seen within 10 minutes with the ε-CL : Zn molar ratio at 5000 : 1; the resulting polycaprolactone (PCL) comprised predominately cyclic structures along with lower levels of trimethylsilylmethyl-capped linear PCL. By comparison, Zn1–Zn5 on treatment with two equivalents of LiN(SiMe3)2 at the same high monomer to zinc ratio, led to catalysts exhibiting an order of magnitude higher activity. Zn1/2LiN(SiMe3)2 in the presence of BnOH exhibited a remarkable TOF of 1.35 × 105 h−1 with 90% monomer conversion within two minutes. In these cases, a distinct selectivity towards linear polymers capped with CH3O end-groups (derived from the quenching solvent) was observed with cyclic polyesters only observable with larger amounts of ε-CL. As a general observation, the 2-R substituent on the chelating ligand showed noticeable effects on the efficiency and on the molecular weight of the PCLs, with 2-Cl-containing Zn4 in combination with LiCH2SiMe3 and BnOH affording the highest molecular weight PCL of the study (9.57 × 104 g mol−1). Based on the microstructural properties of the PCL, distinct mechanisms (viz., coordination–insertion and ring expansion) have been proposed to account for the mode of propagation mediated by Zn/2LiCH2SiMe3 and Zn/2LiN(SiMe3)2. In addition, a zinc silylamido L1−HZn[N(SiMe3)2] (Zn7) species has been tentatively assigned (obtained via deprotonation of L1 with Zn[N(SiMe3)2]2), that proved inactive for the ROP of ε-CL but displayed good activity for ROP of rac-LA.
✓ 已验证
DOI
高影响因子
Journal of Information Display
·
2019
·
IF 0
Xiaoliang Pang,Xuejie Zhang,Bingfu Lei,Haoran Zhang
Embedding CsPbX3 (X = Cl, Br, I) perovskites QDs in inorganic glass matrix via in-situ crystallization has been regarded as a feasible strategy to improve their stability against water, heat, and light irradiation. However, the tunable-emission range of these CsPbX3-nanocrystals-embedded glasses is still narrow, insufficient to cover a wide color gamut. Herein, a simple synthetic method was developed in this study to obtain the tunable-emission CsPb(Cl/Br)3 quantum dots (QDs) in boro-germanate glass (CsPb(Cl/Br)3 QDs@glass) by controlling the molar ratio of PbBr2/PbCl2. With the increase of the PbBr2 concentration from 1.6 to 3.2 mol%, the emission wavelength of CsPb(Cl/Br)3 QDs@glasses can be shifted from 448 to 485 nm, and the corresponding photoluminescence quantum yield (PLQY) increases from 0.61 to 24.43%. In addition, the CsPb(Cl/Br)3 QDs@glass exhibits impressing promotion of thermal stability, photostability, and water resistance due to the excellent protective function of the glass matrix. As a proof-of-concept experiment, a LED device was fabricated by employing the optimal CsPb(Cl/Br)3 QDs@glass with a commercial 375 nm UV chip, yielding an intense cyan light. All the results indicate that the investigated CsPb(Cl/Br)3 QDs@glasses may find promising applications as color convertors in wide-color-gamut liquid crystal displays (LCDs).
✓ 已验证
DOI
Inorganic Chemistry Frontiers
·
2021
·Vol. 8
·期 23
·5113-5123
·
IF 6.569
Runtian Kang,Hang Chen,Ruijie Ji,Haoyang Wang,Takatoshi Seto,Yuhua Wang
It is of great significance for white light-emitting diodes (wLEDs) to explore new, efficient and stable inorganic phosphors excited by wideband near-ultraviolet (n-UV) light. A new type of efficient emission-tunable Ce3+/Mn2+ doped Ca2YHf2Al3O12 (CYHAO) garnet phosphor which can be excited by n-UV light is studied in this work. Due to the effective energy transfer (ET) from Ce3+ to Mn2+ in CYHAO, CYHAO:0.09Ce3+,xMn2+ phosphors have a wide excitation band in the 370–470 nm region with a peak at 410 nm. Under excitation at 410 nm, all the samples show tunable color emission and match with the near UV chip. Through the decay time, it is determined that the energy transfer efficiency is as high as 88.83%. The calculated activation energy is about 0.217 eV, indicating the relatively good thermal stability. The cathodoluminescence (CL) properties show that the phosphor has a high saturation current and saturation voltage. A single component white LED is fabricated by using the CYHAO:0.09Ce3+,0.3Mn2+ phosphor and a 400 nm n-UV chip. It is worth noting that the detailed study of the energy transfer mechanism, thermal quenching mechanism and CL mechanism has reference value for the development of new co-doped phosphors.
✓ 已验证
DOI
高影响因子
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
·
2020
·Vol. 2020
·期 7
·626-630
·
IF 2.529
Min Li,Guan-Cheng Xu,Wen-Bo Xin,Yin-Qiang Zhang
Graphical The new organic-inorganic hybrid compound (CH 3 NH 3 ) 4 [InCl 6 ]Cl has been successfully synthesized by reaction of methylammonium with indium(III) chloride tetrahydrate. It undergoes a first-order phase transition accompanied with an obvious step-like dielectric switching. A new organic-inorganic phase transition material (CH 3 NH 3 ) 4 [InCl 6 ]Cl ( 1 ), has been successfully synthesized and characterized. The compound undergoes a reversible first-order phase transition at Curie temperature Tc=284 K, accompanied with a wide hysteresis of 12 K, which investigated by differential scanning calorimetry (DSC). The temperature dependence of the dielectric permittivity discloses an obvious step-like dielectric anomaly. Single crystal X-ray diffraction reveals that the order-disorder transition of the [InCl 6 ] 3– anion and the methylammonium cation were the main factor drove the phase transition from high temperature phase with the space group P 2/ m to low temperature phase with the space group P 2/ n . This finding indicates that In-based organic–inorganic hybrids compounds can be used to build phase transition materials, which broaden the way for exploring dielectric switching materials.
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2025
·
IF 7.7
Yunfeng Tan,Shengqiang Ma,Nengsheng Liu,Xintao Wang,Chenxi Li,Jinmao Ma,Kun Wu,Mohe Zhang,Jinxin Liu,Jianwei Song,Jiangzhou Qin,Quanlin Zhao,Zhengfang Ye
Industrial wastewater pollution has emerged as a significant global environmental challenge, particularly regarding the urgent need to address highly acidic industrial effluents containing organic pollutants. As a novel high-energy explosive, hexanitrohexaazaisowurtzitane (CL-20) inevitably generates strongly acidic wastewater during its production and application processes, posing severe threats to ecological systems and human health. This study systematically investigates the adsorption performance of two silicon-based materials, sodium silicate (Na 2 SiO 3 ) and silicic acid (H 2 SiO 3 ), for the removal of CL-20 from wastewater. Experimental results demonstrate that the Langmuir isotherm model reveals maximum adsorption capacities of 87.21 and 69.97 mg/g for H 2 SiO 3 and Na 2 SiO 3 , respectively. Kinetic studies indicate that the adsorption processes of both materials conform to the pseudo-second-order kinetic model (R 2 > 0.98). Thermodynamic parameter analysis demonstrates reduced spontaneity of the adsorption process with increasing temperature, accompanied by exothermic characteristics and entropy reduction. Through density functional theory (DFT) calculations, the mechanisms underlying electrostatic adsorption and chemical bonding interactions between CL-20 molecules and silicon-based materials are elucidated. This research establishes a novel technical approach for efficient CL-20 wastewater treatment while providing theoretical foundations for developing and optimizing related adsorption materials.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Handong Shi,Shijiao Li,Kai Han,Chuanhao Xu,Lei Gao,Fan Liao,Yanpeng Lv,Yurong Zhang,Chongwei An
This study presents a strategy for developing CL-20 (Hexanitrohexaazaisowurtzita-ne)-based energetic composites with enhanced mechanical properties and intrinsic safety through the synergistic design of PVA (polyvinyl alcohol) /PAA (polyacrylic acid) interpenetrating polymer networks (IPNs) and direct ink writing (DIW) technology. Based on the “hydrogen bond-covalent bond-plasticization” synergistic reinforcement strategy, an IPNs gel system with tunable mechanical properties was developed. After optimizing the polymer ratio (4:3), Crosslinking agent (1 %), and glycerol content (17.5 %), a balance between toughness, ductility, and strength was attained. The DIW-printed structure exhibited excellent molding accuracy and interfacial adhesion (0.924 MPa to aluminum). System characterization demonstrated that the IPN structure achieved uniform CL-20 distribution and controlled porosity, significantly enhancing its mechanical properties, safety, and detonation performance. Its elastic modulus is close to that of engineering plastics(4.504 GPa), the hardness is between soft rubber and hard plastics (0.107 GPa), and the compressive strength is higher than that of typical PBX explosives (15.64 MPa). By using PVA/PAA IPNs, a “topological entanglement-passivation defect” mechanism was established to suppress mechanical sensitivity. Compared to submicron ε-CL-20, the molded sample reduced impact sensitivity by 33.3 % and friction sensitivity by 128.6 %. Additionally, detonation propagation was achieved in a 1.2 × 1.2 mm charge slot within a 90°-160° corner range, with the critical detonation transmission size reaching 0.3 × 0.3 mm and the detonation velocity maintained at 7362 m/s (82.4 % theoretical detonation velocity). This study offers a scalable manufacturing framework for developing energetic devices that combine mechanical properties, intrinsic safety, and adaptability to complex structures.
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 5
·1858-1864
·
IF 3.288
Zongkai Wu,Jiangfeng Pei,Xiuduo Song,Ning Liu,Jianguo Li,Ming Zhang,Jun Zhang,Dongxiang Zhang,Fengqi Zhao
The DSC-TG-MS-FTIR coupling technique and in situ FTIR technique were used to study the catalytic effects of nano-Fe2O3 and rGO–Fe2O3 on the thermal decomposition behaviors of CL-20/HMX cocrystals. The results showed nano-Fe2O3 having a good catalytic effect on the thermal decomposition of the CL-20/HMX cocrystal. Nano-Fe2O3 was found to enhance CO2 production and prevent the production of NH2+, HCN, and CHO or N2H+ during the decomposition of cocrystalline CL-20/HMX. Meanwhile, both the CL-20/HMX thermal decomposition peak temperature and Ea were reduced by including nano-Fe2O3. The inclusion of rGO–Fe2O3 did not enhance the catalytic effect of nano-Fe2O3, but did reduce residue formation during the CL-20/HMX decomposition process. Breaking of N–N bonds and the release of NO2 were concluded to constitute the initial steps of the decomposition of the CL-20/HMX cocrystal. This investigation has contributed to our understanding of the thermal decomposition of the CL-20/HMX cocrystal and provides guidance for the catalytic decomposition of energetic material cocrystals.
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2020
·Vol. 9
·期 6
·2047-2053
·
IF 7.059
Guojun Zhou,Zhiyang Liu,Maxim S. Molokeev,Zewen Xiao,Zhiguo Xia,Xian-Ming Zhang
Low-dimensional-networked metal halides are attractive for the screening of emitters applied in solid-state lighting and displays, but the lead toxicity and poor stability are obstacles that must be overcome in industrial applications. Herein, we aim at the discovery of bright and stable photoluminescence in zero-dimensional (0D) Mn2+-based metal halides. By manipulation of Cl/Br transmutation, the nature of the halogen can be confirmed as a pivotal factor to tune the PL behaviors, and the optimum Mn2+ emission with a high PLQY of 99.8% and a short lifetime of 0.372 ms can be achieved in (C24H20P)2MnBr4. The thermal quenching behaviors have been discussed in depth, indicating that the synergistic effect of good chemical stability of organic groups, a long Mn⋯Mn distance of 10.447 Å and a relatively large activation energy (ΔE = 0.277 eV) provides a platform for achieving excellent thermal stability in (C24H20P)2MnBr4. Moreover, the as-fabricated white LED device with a high luminous efficacy of 118.9 lm W−1 and a wide color gamut of 105.3% National Television System Committee (NTSC) shows that (C24H20P)2MnBr4 can be employed as a desirable narrow-band green emitter for LED displays. This work provides a new understanding of fine tailoring halogens, and proposes a feasible approach to achieving high thermal stability emitters toward the targeted practical applications.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）