{"title":"Graphene oxide hybrid with amine‐terminated poly(amidoamine) dendrimers encapsulating Pt nanoparticles for electrochemical oxygen reduction reaction","authors":"Jiwoon Kim, Joohoon Kim","doi":"10.1002/bkcs.12436","DOIUrl":"https://doi.org/10.1002/bkcs.12436","url":null,"abstract":"","PeriodicalId":9457,"journal":{"name":"Bulletin of The Korean Chemical Society","volume":"10 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2021-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84307487","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}
{"title":"Advances in electrochemical aptasensing for cardiac biomarkers","authors":"M. Rahman, Nasrin Siraj Lopa, Jae‐Joon Lee","doi":"10.1002/bkcs.12434","DOIUrl":"https://doi.org/10.1002/bkcs.12434","url":null,"abstract":"","PeriodicalId":9457,"journal":{"name":"Bulletin of The Korean Chemical Society","volume":"1 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2021-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83231947","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}
{"title":"Study on melting and crystallization of\u0000 PHBHx\u0000 thin films using\u0000 IR\u0000 and\u0000 2D\u0000 correlation spectroscopy","authors":"Minkyoung Kim, I. Noda, Yeonju Park","doi":"10.1002/bkcs.12437","DOIUrl":"https://doi.org/10.1002/bkcs.12437","url":null,"abstract":"","PeriodicalId":9457,"journal":{"name":"Bulletin of The Korean Chemical Society","volume":"16 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2021-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79228724","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}
{"title":"Composite silver nanosurfaces of dipole and quadrupole surface plasmon resonances for fluorescence enhancements","authors":"Daedu Lee, Gyounghyun Song, Yoonsoo Pang","doi":"10.1002/bkcs.12428","DOIUrl":"https://doi.org/10.1002/bkcs.12428","url":null,"abstract":"","PeriodicalId":9457,"journal":{"name":"Bulletin of The Korean Chemical Society","volume":"30 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2021-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74770200","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}
Seunghoon Lee, Woojin Park, H. Nakata, M. Filatov, Chong Ju Choi
{"title":"Recent advances in ensemble density functional theory and linear response theory for strong correlation","authors":"Seunghoon Lee, Woojin Park, H. Nakata, M. Filatov, Chong Ju Choi","doi":"10.1002/bkcs.12429","DOIUrl":"https://doi.org/10.1002/bkcs.12429","url":null,"abstract":"","PeriodicalId":9457,"journal":{"name":"Bulletin of The Korean Chemical Society","volume":"45 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2021-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79858519","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}
{"title":"Recent research trends in fluorescent\u0000 reporters‐based\u0000 lateral flow immunoassay for protein biomarkers specific to acute myocardial infarction","authors":"M. Supianto, H. Lee","doi":"10.1002/bkcs.12430","DOIUrl":"https://doi.org/10.1002/bkcs.12430","url":null,"abstract":"","PeriodicalId":9457,"journal":{"name":"Bulletin of The Korean Chemical Society","volume":"180 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2021-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76927987","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}
Two-dimensional materials represented by graphene and transition metal dichalcogenides undergo charge transfer (CT) processes and become hole-doped in strong mineral acids. Nonetheless, their mechanisms remain unclear or controversial. This work proposes and verifies two distinctive CT channels in sulfuric acids, respectively driven by oxygen reduction reaction involving O2/H2O redox couples and reduction of bisulfate or related species. Acid-induced changes in the charge density of graphene were in-situ quantified as a function of oxygen content using Raman spectroscopy. At acid concentrations lower than 6 M, the former channel is operative, requiring dissolved O2. Above 6 M, the degree of CT was even higher because the former is cooperated with by the latter channel, which does not need dissolved oxygen. The mechanism revealed in this study will advance our fundamental understanding of how low-dimensional materials interact with chemical environments. Surface charge transfer (CT) doping or chemical doping refers to the charge injection by adsorbed dopant molecules (electron donor or acceptor). The method, demonstrated early for conductive polymers, is highly effective for low-dimensional materials because of their high fraction of surface atoms. Graphene, a representative two-dimensional (2D) material, strongly interacts with I2, Br2, NO2 and alkali metals, and undergoes substantial changes in its charge density and thus Fermi level. Such changes enabled graphene to be used in the single-molecule detection, pH sensor, photodetector, solar cell and so on. Similar chemical doping has also been successfully exploited for semiconducting 2D materials. 10 Despite the wide functional tunability and potential applications enabled by CT doping, however, its mechanistic details still remain unclear or unexplored except for simple dopants that do not involve bondbreaking chemistry during the doping process. For example, single-entity dopants like atomic K and molecular halogens inject charges upon adsorption and remain as monovalent ionic adsorbates. In contrast, the O2-mediated hole doping of 2D materials had been controversial for a considerable period because of the intertwined roles of oxygen, water and substrates. 12, 13, 14 Recent studies showed that O2/H2O redox couples drive the oxygen reduction reaction (ORR: O2 + 4H + 4e ↔ 2H2O) serving as composite hole dopants in graphene and 2D semiconductors. 14 Although chemical doping with mineral acids has been widely used to enhance electrical conductivity in graphene 15, , the CT process itself has not been scrutinized until recently. Because the ORR consumes electrons of graphene efficiently at low pH as confirmed for HCl solution, the same process should occur in other acids. However, there may be an additional doping channel where their conjugate bases play a role. For example, chemical doping by H2SO4 solution may be more complex than that by HCl because of bisulfate ions (HSO4) and other potentiall
{"title":"Dual‐channel charge transfer doping of graphene by sulfuric acid","authors":"Kwnaghee Park, S. Ryu","doi":"10.1002/bkcs.12443","DOIUrl":"https://doi.org/10.1002/bkcs.12443","url":null,"abstract":"Two-dimensional materials represented by graphene and transition metal dichalcogenides undergo charge transfer (CT) processes and become hole-doped in strong mineral acids. Nonetheless, their mechanisms remain unclear or controversial. This work proposes and verifies two distinctive CT channels in sulfuric acids, respectively driven by oxygen reduction reaction involving O2/H2O redox couples and reduction of bisulfate or related species. Acid-induced changes in the charge density of graphene were in-situ quantified as a function of oxygen content using Raman spectroscopy. At acid concentrations lower than 6 M, the former channel is operative, requiring dissolved O2. Above 6 M, the degree of CT was even higher because the former is cooperated with by the latter channel, which does not need dissolved oxygen. The mechanism revealed in this study will advance our fundamental understanding of how low-dimensional materials interact with chemical environments. Surface charge transfer (CT) doping or chemical doping refers to the charge injection by adsorbed dopant molecules (electron donor or acceptor). The method, demonstrated early for conductive polymers, is highly effective for low-dimensional materials because of their high fraction of surface atoms. Graphene, a representative two-dimensional (2D) material, strongly interacts with I2, Br2, NO2 and alkali metals, and undergoes substantial changes in its charge density and thus Fermi level. Such changes enabled graphene to be used in the single-molecule detection, pH sensor, photodetector, solar cell and so on. Similar chemical doping has also been successfully exploited for semiconducting 2D materials. 10 Despite the wide functional tunability and potential applications enabled by CT doping, however, its mechanistic details still remain unclear or unexplored except for simple dopants that do not involve bondbreaking chemistry during the doping process. For example, single-entity dopants like atomic K and molecular halogens inject charges upon adsorption and remain as monovalent ionic adsorbates. In contrast, the O2-mediated hole doping of 2D materials had been controversial for a considerable period because of the intertwined roles of oxygen, water and substrates. 12, 13, 14 Recent studies showed that O2/H2O redox couples drive the oxygen reduction reaction (ORR: O2 + 4H + 4e ↔ 2H2O) serving as composite hole dopants in graphene and 2D semiconductors. 14 Although chemical doping with mineral acids has been widely used to enhance electrical conductivity in graphene 15, , the CT process itself has not been scrutinized until recently. Because the ORR consumes electrons of graphene efficiently at low pH as confirmed for HCl solution, the same process should occur in other acids. However, there may be an additional doping channel where their conjugate bases play a role. For example, chemical doping by H2SO4 solution may be more complex than that by HCl because of bisulfate ions (HSO4) and other potentiall","PeriodicalId":9457,"journal":{"name":"Bulletin of The Korean Chemical Society","volume":"180 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2021-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80178105","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}
Hogeun Chang, M. S. Bootharaju, Sanghwa Lee, J. Kim, Byung Hyo Kim, T. Hyeon
{"title":"To inorganic nanoparticles via nanoclusters: Nonclassical nucleation and growth pathway","authors":"Hogeun Chang, M. S. Bootharaju, Sanghwa Lee, J. Kim, Byung Hyo Kim, T. Hyeon","doi":"10.1002/bkcs.12388","DOIUrl":"https://doi.org/10.1002/bkcs.12388","url":null,"abstract":"","PeriodicalId":9457,"journal":{"name":"Bulletin of The Korean Chemical Society","volume":"3 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2021-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75311883","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}
{"title":"Organocatalytic enantioselective synthesis of phthalans via Wittig/\u0000 oxa‐Michael\u0000 cascade reaction","authors":"E. Son, Jae-Duck No, Sung‐Gon Kim","doi":"10.1002/bkcs.12402","DOIUrl":"https://doi.org/10.1002/bkcs.12402","url":null,"abstract":"","PeriodicalId":9457,"journal":{"name":"Bulletin of The Korean Chemical Society","volume":"15 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2021-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73215390","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}
{"title":"A mononuclear nonheme manganese(\u0000 III\u0000 )‐acylperoxo complex: Synthesis, characterization, and reactivity studies","authors":"Hye-been Jeon, S. Choi, Seungwoo Hong","doi":"10.1002/bkcs.12391","DOIUrl":"https://doi.org/10.1002/bkcs.12391","url":null,"abstract":"","PeriodicalId":9457,"journal":{"name":"Bulletin of The Korean Chemical Society","volume":"16 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2021-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79442880","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：