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已有 1364 次阅读 2020-6-29 14:41 |个人分类:发表作品|系统分类:论文交流


论文题目:Metal salt assisted electrospray ionization mass spectrometry for the soft ionization of GAP polymers in negative ion mode

论文作者:Theoneste Muyizere, Yajun Zheng, Hongni Liu, Jia Zhao, Jin Li, Xianming Lu, Daniel E. Austinc, Zhiping Zhang

发表日期:January 07, 2020

论文摘要:Glycidyl azide polymers (GAP) are one of the most important energetic polymers, but it is still a challenge to elucidate their structures using mass spectrometry due to their fragility upon ionization. Herein we developed a soft metal salt assisted electrospray ionization (MSAESI) to characterize directly GAP polymers using mass spectrometry. This technique combines paper spray ionization and the complexing effect of anions from metal salts with GAP in the negative ion mode to softly ionize GAP polymers prior to mass spectrometry analysis. The effects of experimental parameters (e.g., ion mode, applied voltage, and type and concentration of metal salts) have been investigated in detail. In contrast to the positive ion mode, a softer ionization was observed for GAP polymers when the negative ion mode was applied. The radius and average charge of cations and anions in metal salts were found to play crucial roles in determining the performance of the MSAESI analysis of GAP. For a given charge number, a smaller radius of cations favored the soft ionization of GAP polymers (e.g., Na+ > K+ > Rb+), whereas a larger radius of anions led to a preferred performance (e.g., F− < Cl− < Br− < I−) due to variation in dissolution ability. For anions with multiple charges, the ones with fewer charges gave a more favorable ionization to the GAP sample because of their better complexing to GAP molecules than those with more charges in the structure of anions (e.g., NO3− > SO42− > PO43−). According to the experimental observation and evidence from mass spectrometry, we proposed the plausible electrospray mechanisms of MSAESI for GAP analysis with the involvement of metal salts. Moreover, the developed protocol has been applied successfully to the analysis of various GAP samples, and works for other types of sources such as nanoelectrospray ionization.


发表期刊:Journal of Materials Chemistry C

论文题目:Low surface energy interface-derived low-temperature recrystallization behavior of organic thin films for boosting carrier mobility

论文作者:Shuya Wang, Zhan Wei,  Yahan Yang, Xiaoli Zhao, Qingxin Tang, Yanhong Tong, Yichun Liua

发表日期:November 28, 2019

论文摘要:Due to low-temperature processing properties and high carrier mobilities, solution-processed small molecule organic thin-film transistors (OTFTs) are promising candidates for enabling low-cost flexible electronic circuits and displays. Much progress has been made in terms of material performance, however, there remain significant concerns about well understanding and controlling the morphology and polymorphism of soluble small molecule organic semiconductor thin films. Here, we investigated the physical mechanisms of the dielectric interfacial properties on the recrystallization of soluble small molecule organic semiconductor thin films, and demonstrated an effective route to improve the thin-film morphology and device performance. We found that a low surface energy interface can derive low-temperature recrystallization behavior of solution-processed organic semiconductor thin films, which has an important impact on boosting the carrier mobility of OTFTs. After low-temperature recrystallization, the carrier mobility of OTFTs is dramatically enhanced by about one order of magnitude. These attractive results suggest that this work allows a better understanding about the role of dielectric interfacial properties in assisting the thin-film recrystallization towards the desirable thin-film morphology, indicating promising potential for future low-cost high-performance solution-processed organic electronic devices.


发表期刊:Energy Environmental Science

论文题目:Ultrafast laser-annealing of perovskite films for efficient perovskite solar cells

论文作者:Peng You, Guijun Li, Guanqi Tang, Jiupeng Cao, Feng Yan

发表日期:April 01, 2020

论文摘要:Perovskite solar cells have attracted much attention recently for their high efficiency, ease of preparation and low cost. Here, we report a novel laser-annealing method for perovskite films at a low substrate temperature by scanning laser spots on the film surfaces. An ultrafast crystallization process within a few seconds is realized under a laser with a high intensity and a fast scanning speed. Because the crystalline perovskite phase has a stronger light absorption than the amorphous phase, the fast laser annealing can induce a higher temperature in the former and lead to the selective growth of large perovskite grains. Under optimum conditions, perovskite films with high crystallinity are successfully fabricated, resulting in perovskite solar cells with high power conversion efficiency and good stability. Moreover, a faster laser-annealing process of perovskite films is achieved by using a linear laser beam, which is expected to be a promising technique for the mass production of large-scale perovskite solar cells.



论文题目:Micro/Nanomaterials: Bridging the Macroworld to Micro/Nanomaterials: Multidisciplinary Science at Tsinghua University

论文作者:Qiang Zhang, Xun Wang, Yuan‐Hua Lin

发表日期:April 16, 2020

论文摘要:The Old Gate is the landmark building of Tsinghua University. Here, the “Old Gate” is architectured by a family of nano‐building‐blocks of graphene, carbon nanotubes, nanoparticles, and so on. In article number 2000856, the current Special Issue, guest edited by Qiang Zhang, Xun Wang, and Yuan‐Hua Lin, is introduced. The issue affords a family of high‐impact publications in fields of micro/nanomaterials research at Tsinghua University.



论文题目:Wearable Electronics: Wearable Electronics Based on 2D Materials for Human Physiological Information Detection

论文作者:Yu Pang, Zhen Yang, Yi Yang, Tian‐Ling Ren

发表日期:April 16, 2020

论文摘要:In article number 1901124, Tian‐Ling Ren and co‐workers comprehensively review wearable electronics based on two‐dimensional materials including graphene, transition‐metal dichalcogenides (TMDs), and transition metal carbides or carbonitrides (MXenes). Due to their extraordinary physiochemical properties, they have displayed promising applications in various physiological information detection.



论文题目:Micro‐/Nanolattices: Design, Fabrication, and Mechanics of 3D Micro‐/Nanolattices

论文作者:Xuan Zhang, Yujia Wang, Bin Ding, Xiaoyan Li

发表日期:April 16, 2020

论文摘要:In article number 1902842, Xiaoyan Li and co‐workers summarize the recent advances in design, fabrication and mechanics of 3D micro‐/nano‐lattices, which is one new type of architected material with minimum characteristic sizes ranging from several micrometers to hundreds of nanometers. Taking advantage of the topological design, structural optimization and size effects of nanomaterials, various 3D micro‐/nano‐lattices composed of different materials exhibit combinations of superior mechanical properties, such as low density, high strength, large deformability, good recoverability, and flaw tolerance.



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