NANO
·
2020
·
IF 1.566
H. Zhang,S. H. Sun,J. C. Liu,F. Hong,Y. Zhu,B. Zhou,Y. M. Hu
Irregular rod-like bismuth sulphochloride (BiSCl) was synthesized by a high efficiency process in which BiCl 3 and Bi 2 S 3 were fully ground and mixed in N 2 atmosphere followed by a sintering at 227 ∘ C for 9 h to achieve crimson BiSCl powder. The products were characterized by X-ray powder diffraction (XRD) and scanning electronic microscopy coupled with energy dispersive X-ray spectroscopy (SEM-EDX). The BiSCl is an n-type semiconductor with a bandgap of 1.9 eV. In the temperature range of 300–500 K, thermal conductivity, electrical conductivity, Seebeck coefficient and thermoelectric figure of merit ZT of the BiSCl were tested and calculated. It is resulted that the BiSCl has a thermal conductivity of 0.45 Wm −1 K −1 at 500 K and a Seebeck coefficient of −579 μVK −1 at 400 K. This work will help inform future in-depth studies on possible applications of BiSCl in the fields of thermoelectricity, optoelectronics and photocatalyticity.
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MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2024
·
IF 4.2
Cunxin Wei,Zhangbin Song,Yan Liu,Bin Zhang,Shasha Song,Luchang Qin,Zengdian Zhao
Nitrogen doped quaternary metal sulfide Cu 6 Fe 2 SnS 8 (CFTS) was prepared by magnetic grinding. The mechanochemical method has the advantage of simple synthesis of non-metallic doped polymetallic sulfides, and there is no solvent involved in the reaction process, which is very environmentally friendly. Non metallic doping can form electron capture centers on semiconductors, suppress the recombination of photo generated electron hole pairs, and extend electron lifetime. Moreover, doping N element into the CFTS lattice will lead to the formation of new energy states, thereby narrowing the energy band gap. The characterizations of XPS and EDS have proven the successful doping of N element into CFTS. In addition, the photocatalytic mechanism and the stability of the N-doped CFTS (N-CFTS) were studied through active substance capture experiments and cyclic experiments. The experimental results indicate that ·O 2 − is the main active substance in the degradation of MB by N-CFTS. After multiple cyclic experiment, the N-CFTS catalytic material still exhibits good crystal structure and photocatalytic stability. This photocatalytic material has great potential for applications in wastewater treatment and environmental remediation.
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APPLIED CATALYSIS A-GENERAL
·
2022
·
IF 5.723
Ruoxuan Liang,Jiwei Li,Yaowei Wang,Zhaoxia Zhang,Bo Luan,Jianjun Liu,Shuya Qian,Shaolong Wan,Deming Zhao,Haifeng Xiong,Shuai Wang,Jingdong Lin,Yong Wang
Oxidative dehydrogenation (ODH) of n-hexane to olefins provides an alternative strategy for efficient utilization of n-hexane. Here, we report that hexagonal boron nitride (h-BN) is selective in ODH of n-hexane, achieving 89.6 % selectivity to olefins at n-hexane conversion of 16.3 % and 550 °C. We found that low temperatures and oxygen rich conditions favor the selective hydrogen abstraction from C-H bond over the cleavage of C-C bond, and the presence of gas phase free radical greatly improves the reaction rate of ODH of n-hexane over h-BN. In addition, an anomalous seagull type of relationship exists between the conversion of n-hexane and reaction temperature, which may be related to the re-distribution of the active sites.
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Journal of Energy Storage
·
2024
·
IF 8.9
Jingjing He,Ming Li,Xi Chen,Yang Wu,Jiahao Sun,Xiaogang Wen
N-doped pomelo peel-derived porous carbon (N-ppPC) is prepared by a combined hydrogel dispersion-activation and freeze-drying process. The obtained layered N-ppPC exhibits excellent capacitive behavior due to its suitable pore-structure and heteroatom doping level, thin layer-thickness as well as high specific surface area. It delivers a high specific capacitance (438 F g −1 at 0.5 A g −1 ) in a three-electrode system. For an assembled coin-type symmetric supercapacitor in aqueous electrolyte, the specific capacitance reaches 264 F g −1 (0.5 A g −1 ), and after 10,000 cycles at a current density of 2 A g −1 , the capacitance retention is as high as 90.9 %. While in ionic liquid electrolyte, the specific capacitance reaches 140 F g −1 (0.2 A g −1 ) with a capacitance retention of 62.9 % at a high current density of 10 A g −1 . Especially, it achieves a high energy density of 59.5 Wh kg −1 at a power density of 174.9 W kg −1 .
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FUEL
·
2022
·
IF 8.035
Jiaxiu Guo,Ting Shen,Juan Liang,Shulin He,Yue Jing,Yinghao Chu,Wanglai Cen
In this paper, an N -doped BiOCl photocatalyst was prepared and systematically characterized. The results showed that N doping does not change the crystal phase of BiOCl but changes the surface morphology of BiOCl nanosheets and increases specific surface area. N -doped BiOCl broadens the light absorption region, narrows the band gap and promotes the separation of the photoexcited carriers. N could be adsorbed on the Bi or to replace Cl atom in the BiOCl lattice, causing the generation of intermediate energy levels in the band gap of N -BiOCl including N 2p-Cl 2p hybrid states, N 2p-O 2p hybrid states or N 2p state. N -BiOCl achieves about 60% removal efficiency of NO under all-light irradiation and exhibits favorable stability and recyclability. The presence of some H 2 O in the reaction system promotes the photodegradation of NO, while O 2 greatly affects the efficiency of NO removal. Moreover, N doping promotes the formation of •O 2 − and •OH on N -BiOCl photocatalyst under all-light irradiation, resulting in the enhancement of photocatalytic oxidation of NO to NO 3 – . NO could be adsorbed on the surface of N -BiOCl or oxidized into NO 2 – under darkness and further oxidized into NO 3 – under all-light irradiation. However, the accumulation of the final product on the catalyst surface results in a decrease in photoactivity.
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CHINESE PHYSICS LETTERS
·
2024
·
IF 3.5
Longfu Li,Lei Shi,Lingyong Zeng,Kuan Li,Peifeng Yu,Kangwang Wang,Chao Zhang,Rui Chen,Zaichen Xiang,Yunwei Zhang,Huixia Luo
Chemical doping is a critical factor in the development of new superconductors or optimizing the superconducting transition temperature (Tc) of the parent superconducting materials. Herein, a new simple urea approach is developed to synthesize the N-doped α-Mo2C. Benefiting from the simple urea method, a broad superconducting dome is found in the Mo2C1-xNx (0 ≤ x ≤ 0.49) compositions. XRD results show that the structure of α-Mo2C remains unchanged and that there is a variation of lattice parameters with nitrogen doping. Resistivity, magnetic susceptibility, and heat capacity measurement results confirm that the superconducting transition temperature (Tc) was strongly increased from 2.68 K (x = 0) to 7.05 K (x = 0.49). First-principles calculations and our analysis indicate that increasing nitrogen doping leads to a rise in the density of states at the Fermi level and doping-induced phonon softening, which enhances electron-phonon coupling. This results in an increase in Tc and a sharp rise in the upper critical field. Our findings provide a promising strategy for fabricating transition metal carbonitrides and provide a material platform for further study of the superconductivity of transition metal carbides.
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International Journal of Applied Mechanics
·
2024
·
IF 2.9
Shahao Li,Yang Chen,Xiaofeng Li,Hongyan Yang,Mengze Lu,Wei Zhang,Chuanxia Jiang,Shuming Cui,Junkai Liang,Liqun Tang,Taolin Sun
Recently, vitrimers with a reversible N → B coordination dynamic structure have garnered interest not only for their self-healing and reprocessable properties but also for their hydrolytic stability. Reported vitrimers with N → B internal coordination dynamic structure were excessively rigid, limiting their stretchability and toughness. This study synthesized a cross-linking agent (DNCB) with a cyclic nitrogen-boron coordination structure. This agent was then used in copolymerization with n-butyl acrylate (BA) and 4-vinylphenylboronic acid (BOH) to create soft vitrimers. By systematically tuning the composition, soft vitrimers exhibit water resistance along with high viscoelasticity, stretchability, toughness, and adhesive properties against various substrates. The observed mechanical behavior is attributed to the rapid relaxation of N → B coordination bonds and slow relaxation of B-O bonds in boroxine within the polymer network. It is anticipated that these soft vitrimers will be applied in adhesives, flexible electronics, and soft robotics due to their favorable properties.
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ACS Applied Nano Materials
·
2022
·
IF 6.14
Xiaoxiang Wu,Yali Liu,Mengge Li,Wenxuan Guo,Tianjian Ou,Cong Xiao,Jiadong Yao,Ying Yu,Yuan Zheng,Yewu Wang
Photodetectors based on two-dimensional materials and their van der Waals (vdW) heterojunctions usually have excellent optoelectronic performance and great potential applications. Herein, gallium (Aladdin, particles, 99.999% trace metal basis), selenium (Aladdin, powder, 99.999% trace metal basis), and iodine (Alfa Aesar, 99.999% trace metal basis) are the raw materials for the growth of gallium selenide (GaSe) single crystals by the chemical vapor transport method, in which iodine is the transport agent. Subsequently, GaSe nanoflakes are exfoliated from the grown bulk GaSe crystals by mechanical exfoliation. The n-Si/p-GaSe van der Waals vertical heterojunctions have been designed and fabricated for photodetection, which show good characteristics including a high responsivity of 1.74 A/W and a fast response/recovery time of 48 μs/88 μs under zero bias owing to their type-II band structure and built-in electric field. The results indicate that n-Si/p-GaSe vdW vertical heterojunctions are promising candidates in future ultrafast optoelectronic devices.
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AUSTRALIAN JOURNAL OF CHEMISTRY
·
2013
·Vol. 66
·期 11
·1361-1369
·
IF 1.869
Yanyan Wang,Libin Liu,Congde Qiao,Tianduo Li
N-Alkyl-substituted polyurethanes with different alkyl chain lengths were prepared from the corresponding bromoalkane (1-bromooctane, 1-bromotetradecane, and 1-bromooctadecane) and polyurethane consisting of poly(propylene glycol) (PPG), 4,4′-diphenylmethane diisocyanate, and 1,4-butanediol. The synthesised materials were characterised by 1H NMR and FTIR spectroscopy and the degrees of substitution were discussed by changing the reaction conditions. Differential scanning calorimetry and X-ray diffraction were used to characterise the thermal properties and crystalline state. Microphase-separated nanostructures, with hard segments (nanofibre-like) embedded into amorphous PPG soft segments, are observed by atomic force microscopy and scanning electron microscopy. A reversible behaviour of the films was revealed by contact angle measurement. Stimuli-responsive films were realised by solvent vapour annealing and heat treatment, and exhibited a reversible switching in surface wettability with a remarkable change in the water contact angle of 21°.
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Qingsong Luo,Yan Chen,Changhao Feng,Shuang Gao,Tianyu Lan,Qiyuan Fu,Runduo Teng
For applications in environmental protection, industrial production, and personal health monitoring by breath exhalation, the sensitive and selective detection of n-butanol is of extreme importance. An n-butanol gas sensor has been developed utilizing LaFeO 3 nanofibers doped with Er 3+ by an electrospinning technique. Compared to the pure sample, the gas sensor shows an improved response of 58.97 to 30 ppm n-butanol, which was boosted by 5.99-fold due to the smaller average grain sizes (21.2 nm), porosity of the nanofiber, and abundant chemical-absorbed oxygen species (38.5%) at an Er doping level of 3 at%. It has excellent selectivity to n-butanol, a fast response/recovery time (17 s/27 s), superior stability during 30 days, and a low detection limit (100 ppb), which indicates that Er-doped LaFeO 3 nanofibers have excellent sensing capabilities for real-time n-butanol detection.
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CHEMICAL PHYSICS LETTERS
·
2024
·
IF 2.8
Ting-ting Yan,Yi-fei Xu,Dong-yang Xi,Zhiqing Yu,Long Ma,Dan-dan Zhang,Ran Jiang
The study investigated the behavior of N-nitropyrazole (1-NP, C 3 H 3 N 3 O 2 ) under high pressure using a diamond anvil cell, Raman spectroscopy, and simulation calculations. The pressure–volume relationship of the sample, molecular interactions, and changes in optical Raman were analyzed. The Raman experiments revealed abnormal vibration intensities and a discontinuity in peak position at 2.2 GPa. For instance, the C-H stretching vibration produces a new vibration peak under pressure, and the NO 2 torsion mode continues to red shift beyond 2.2 GPa. These observations suggest that the crystal’s phase transition results from the distortion of its hydrogen-bonded network structure. The pressure relief experiment confirms the reversibility of the phase transition.
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Jiayi Qu,Yujun Guo,Xingtai Chen,Xiaoning Wang,Davoud Dastan,Xi-Tao Yin,Xiaoguang Ma
Dy 2 O 3 -CdS nanomaterials was firstly prepared by a one-step hydrothermal method for the rapid detection of n-butanol. In comparison with the sensor solely based on CdS, the integrated gas sensitivity performance of the sensor S 2 (containing 10 mol % Dy 2 O 3 ) for n-butanol was significantly improved, with a response value of up to 130, 3.25 times higher than that of the pristine CdS for 100 ppm n-butanol gas at an optimal operating temperature of 200 °C, this represents a substantial enhancement in the sensitivity of n-butanol detection, outperforming many existing sensing materials. Secondly, the sensor not only demonstrates excellent selectivity and long-term stability towards n-butanol but also enables highly precise detection within the wide concentration range of 5-300 ppm, Additionally, it possesses a fast response/recovery time of 25/18 s, significantly improving the detection efficiency. After a sequence of characterization utilizing XRD (X-ray diffraction), SEM (scanning electron microscope), TEM (transmission electron microscope), XPS (X-Ray photoelectron spectroscopy), the study reveals that the superior gas-sensing performance is attributed to the formation of n-n type heterojunctions, the interconnection of CdS nanomicrospheres by Dy 2 O 3 nanorods that facilitates gas transport, and the unique 4f electrons of Dy 2 O 3 . These findings provide new insights into the design of high-performance gas sensors, distinguishing this work from previous studies and making it a valuable contribution to the field of n-butanol detection.
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