Chinese Journal of Chemical Physics最新文献_第3页

Effect of Na+ on preparation of biochars and their applications in energy storage Na+对生物炭制备的影响及其在储能中的应用

4区化学

Chinese Journal of Chemical Physics Pub Date : 2024-09-16 DOI: 10.1063/1674-0068/cjcp2404046

Yamin Li, Huiyan Feng, Qingqing Li, Linqing Li, Xiaoyi Tan, Shuang Wang, Yue Gu, Jun Tan

{"title":"Effect of Na+ on preparation of biochars and their applications in energy storage","authors":"Yamin Li, Huiyan Feng, Qingqing Li, Linqing Li, Xiaoyi Tan, Shuang Wang, Yue Gu, Jun Tan","doi":"10.1063/1674-0068/cjcp2404046","DOIUrl":"https://doi.org/10.1063/1674-0068/cjcp2404046","url":null,"abstract":"This work investigated the effect of Na2CO3 on the char structures of cellulose and lignin, respectively, and examined the electrochemical performance of the char by acting as an active material for coin cells. The morphology of char can be significantly steered by the concentration of Na2CO3. Scanning electron microscopy analysis demonstrated that the introduction of Na2CO3 into cellulose at an appropriate concentration led to the formation of tubular structure on its surface after pyrolysis, whereas the tubular structure was absent in the lignin char with the addition of Na2CO3 at any concentrations. X-ray diffraction and Raman spectroscopy characterizations revealed that all the obtained chars from both cellulose and lignin, with or without Na2CO3, were ascribed to non-crystalline graphite. Nevertheless, the crystal orientation of graphite from cellulose and lignin changed after the catalysis of Na2CO3. Further electrochemical tests showed that cellulose char had a higher sodium storage capacity than that of lignin char. The excellent electrochemical performance of carbon materials derived from cellulose might hold a prospective application in the field of energy storage.","PeriodicalId":10036,"journal":{"name":"Chinese Journal of Chemical Physics","volume":"38 4","pages":"479-486"},"PeriodicalIF":0.0,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147330774","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Reusable shape-memory amorphous structure color photonic paper for press printing 印刷用可重复使用的形状记忆非晶结构彩色光子纸

4区化学

Chinese Journal of Chemical Physics Pub Date : 2024-09-16 DOI: 10.1063/1674-0068/cjcp2405072

Yu Miao, Meixing Ai, Mingshuo Tang, Zhiwei He, Zhihao Wang, Yunlong Wang

引用次数: 0

Mechanistic insights into excitonic photoluminescence in hybrid organic–inorganic perovskites with targeted regulation of organic cations 有机阳离子定向调控的有机-无机杂化钙钛矿激子光致发光机理研究

4区化学

Chinese Journal of Chemical Physics Pub Date : 2024-09-16 DOI: 10.1063/1674-0068/cjcp2407093

Chunyin Ye, Yujie Zhou, Shenlong Jiang, Qun Zhang

{"title":"Mechanistic insights into excitonic photoluminescence in hybrid organic–inorganic perovskites with targeted regulation of organic cations","authors":"Chunyin Ye, Yujie Zhou, Shenlong Jiang, Qun Zhang","doi":"10.1063/1674-0068/cjcp2407093","DOIUrl":"https://doi.org/10.1063/1674-0068/cjcp2407093","url":null,"abstract":"We report a mechanistic study of excitonic photoluminescence in predesigned hybrid organic–inorganic perovskite (HOIP) systems, i.e., (DMAEA)Pb2I6, (DMAPA)PbI4, (DEAEA)Pb2I6, and (DEAPA)4Pb5I18, featuring targeted regulation of organic cations. Starting from the prototype DMAEA (i. e.,2-N,N-dimethylamino-l-ethylamine) for (DMAEA)Pb2I6, the other three HOIPs differ only in the extensions with CH2 group(s) at the “head” or/and “tail” of DMAEA that is an “alkylated ammonia”. Their crystal structures are constructed and structural distortions are evaluated. The steady-state/transient absorption and emission spectroscopic characterizations, combined with the band-structure calculations, are conducted. The two different photoluminescence (PL) mechanisms are identified, i.e., PL emissions dominated by free excitons for (DMAPA)PbI4 and by self-trapped excitons for (DMAEA)Pb2I6, (DEAEA)Pb2I6, and (DEAPA)4Pb5I18. The self-trapped excitonic effect involved in the latter three HOIPs is quantitatively analyzed. This work would be of guiding value for the design of HOIP systems based on organic-cation engineering, beneficial for the pertinent performance optimization in light-emitting applications.","PeriodicalId":10036,"journal":{"name":"Chinese Journal of Chemical Physics","volume":"37 6","pages":"869-877"},"PeriodicalIF":0.0,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147920062","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Water-assisted growth of Bi2Te3-Sb2Te3 lateral heterostructures for enhanced second harmonic generation 水辅助生长Bi2Te3-Sb2Te3横向异质结构增强二次谐波产生

4区化学

Chinese Journal of Chemical Physics Pub Date : 2024-05-10 DOI: 10.1063/1674-0068/cjcp2401016

Xinfeng Wang, Han Wang, Yiran Wu, Yulong Lian, Jinyang Liu, Sangen Zhao

{"title":"Water-assisted growth of Bi2Te3-Sb2Te3 lateral heterostructures for enhanced second harmonic generation","authors":"Xinfeng Wang, Han Wang, Yiran Wu, Yulong Lian, Jinyang Liu, Sangen Zhao","doi":"10.1063/1674-0068/cjcp2401016","DOIUrl":"https://doi.org/10.1063/1674-0068/cjcp2401016","url":null,"abstract":"The heterostructures incorporated with two or more distinctive two-dimensional (2D) materials have attracted great attention because they could give rise to enhanced property in comparison with their individual counterparts. Here, a water-assisted twostep rapid physical vapor deposition (rPVD) method was explored and used to synthesize Bi2Te3-Sb2Te3 lateral heterostructures (LHS) successfully. The Bi2Te3-Sb2Te3 LHS is in nearly uniform size, and grows along three particular orientations with the intersection angles of 120°. Interestingly, we found that the water molecules play a significant role in determining the growth orientation, namely whether it will grow along the vertical or lateral direction in 2D structure. Hence, a growth mechanism of LHS based on the water-assisted two-step rPVD was present, which can be used as a general strategy and extended to the growth of other 2D heterostructures or homostructures, such as SnS-SnSe LHS and SnS-SnS lateral homostructures. Furthermore, the second-harmonic generation intensity of the Bi2Te3-Sb2Te3 LHS is much stronger than that of the Bi2Te3/Sb2Te3 vertical heterostructures (VHS). This work opens a new approach for the synthesis of water-assisted lateral 2D heterostructures or homostructures and offers a new method to enhance the second-harmonic generation properties of topological insulating materials.","PeriodicalId":10036,"journal":{"name":"Chinese Journal of Chemical Physics","volume":"38 2","pages":"240-248"},"PeriodicalIF":0.0,"publicationDate":"2024-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147894748","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Fabrication and excellent properties of polyvinylidene fluoride/graphene composite films as thermal interface materials 作为热界面材料的聚偏氟乙烯/石墨烯复合薄膜的制备及其优异性能

4区化学

Chinese Journal of Chemical Physics Pub Date : 2024-05-10 DOI: 10.1063/1674-0068/cjcp2312136

Yu Zhou, Li Zuo, Azizur Rahman, Bo Hong, Hongwei Chen, Linchao Zhang, Hongbo Ju, Junfeng Yang

{"title":"Fabrication and excellent properties of polyvinylidene fluoride/graphene composite films as thermal interface materials","authors":"Yu Zhou, Li Zuo, Azizur Rahman, Bo Hong, Hongwei Chen, Linchao Zhang, Hongbo Ju, Junfeng Yang","doi":"10.1063/1674-0068/cjcp2312136","DOIUrl":"https://doi.org/10.1063/1674-0068/cjcp2312136","url":null,"abstract":"The growing concern about thermal conductivity and electromagnetic shielding m electronic equipment has promoted the development of interfacial film materials. In this work, polyvinylidene fluoride (PVDF)/graphene composite films with different graphene contents were fabricated by high-energy ball milling, cold isostatic pressing, scraping and coating, successively. High-energy ball milling is beneficial to the dispersion of graphene powder, while cold isostatic pressing can greatly enhance thermal conductivity and mechanical strength by reducing the voids in the film and increasing the contact area of graphene sheets. The thermal conductivity, tensile strength and electromagnetic shielding properties of the films were carefully investigated and compared. It was demonstrated that the thermal conductivity increased from 0.19 W·m-1·K-1 for pure PVDF to 103.9 W·m-1·K-1 for the composite film with PVDF:graphene=l:3. Meanwhile the electromagnetic shielding efficiency can reach 36.55 dB. The prepared PVDF/ graphene composite films exhibit outstanding overall performance and have the potential for practical applications.","PeriodicalId":10036,"journal":{"name":"Chinese Journal of Chemical Physics","volume":"37 5","pages":"671-678"},"PeriodicalIF":0.0,"publicationDate":"2024-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147917035","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ultraviolet photoemission spectra of aqueous thymidine by liquid-microjet photoelectron spectroscopy: A combined experimental error assessment 液体-微射流光电子能谱法测定胸苷的紫外光谱：一种联合实验误差评估方法

4区化学

Chinese Journal of Chemical Physics Pub Date : 2024-04-02 DOI: 10.1063/1674-0068/cjcp2402024

Piao Xu, Jian-Duo Lu, Dongdong Wang, Duoduo Li, Jinyou Long, Song Zhang, Bing Zhang

{"title":"Ultraviolet photoemission spectra of aqueous thymidine by liquid-microjet photoelectron spectroscopy: A combined experimental error assessment","authors":"Piao Xu, Jian-Duo Lu, Dongdong Wang, Duoduo Li, Jinyou Long, Song Zhang, Bing Zhang","doi":"10.1063/1674-0068/cjcp2402024","DOIUrl":"https://doi.org/10.1063/1674-0068/cjcp2402024","url":null,"abstract":"Photoemissions from aqueous solutions are prone to elastic and inelastic electron scattering, streaming potential, and space charge effect errors; however, direct assessments of their individual contributions are still a daunting challenge. Herein, to assess how these errors in a combined experimental error manner influence on the genuine photoelectron kinetic energy (PKE) spectra, the ultraviolet PKE (or electron binding energy, eBE) spectra of aqueous thymidine at different solution flow rates and laser energies were investigated by femtosecond liquid-microjet photoelectron spectroscopy. The accurate vertical eBE value of 11.33 eV for the lbi orbital of liquid water was used to calibrate the observed eBE spectra of aqueous thymidine, and the corresponding combined experimental error for the eBE of the lbi orbital of liquid water was estimated to be about 200 meV. The average combined experimental error for the vertical eBE values of the cationic ground state D0(π−1) and the cationic first excited state D1(n-−1) of aqueous thymidine was estimated to be less than 3%, i.e., in the range of several tens of meV to 200 meV, depending on different flow rates and laser energies.","PeriodicalId":10036,"journal":{"name":"Chinese Journal of Chemical Physics","volume":"37 3","pages":"439-448"},"PeriodicalIF":0.0,"publicationDate":"2024-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147912811","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Stability of fluorescence emission from gold nanoclusters and photocatalytic redox on surface 金纳米团簇荧光发射的稳定性及其表面光催化氧化还原

4区化学

Chinese Journal of Chemical Physics Pub Date : 2024-04-02 DOI: 10.1063/1674-0068/cjcp2312132

Johar Zeb, Huijun Guo, Qunhui Yuan, Wei Gan

引用次数: 2

Review and perspective of single-molecule spectroscopy for chemistry 化学单分子光谱学的回顾与展望

4区化学

Chinese Journal of Chemical Physics Pub Date : 2024-04-01 DOI: 10.1063/1674-0068/cjcp2312144

Mingyi Xie, Yuxi Tian

引用次数: 2

Photoluminescence enhancement of aluminum ion intercalated MoS2 quantum dots 铝离子嵌入二硫化钼量子点的光致发光增强

4区化学

Chinese Journal of Chemical Physics Pub Date : 2023-10-01 DOI: 10.1063/1674-0068/cjcp2206101

Yanmin Kuang, Wenli He, Zhichao Zhu, Yaru Chen, Dongwei Ma, Xiaojuan Wang, Lijun Guo, Yulu He, Zhen Chi, Xia Ran, Luogang Xie

引用次数: 0

Energy transfer dynamics between carbon quantum dots and molybdenum disulfide revealed by transient absorption spectroscopy 瞬态吸收光谱研究碳量子点与二硫化钼之间的能量传递动力学

4区化学

Chinese Journal of Chemical Physics Pub Date : 2023-10-01 DOI: 10.1063/1674-0068/cjcp2208129

Ruixiang Wu, Xin Liu, Xiaoshuai Wang, Jingjing Luo, Bin Li, Shengzhi Wang, Xiangyang Miao

引用次数: 0