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| 1 | Radiation-pressure-induced photoluminescence enhancement of all-inorganic perovskite CsPbBr3 quantum dots显示文摘Perovskite quantum dots(QDs) are of great interest due to their outstanding optoelectronic properties and tremendous application potential. Improving photoluminescence(PL) spectra in all-inorganic perovskite QDs is of great importance for performance enhancement. In this work, the PL quantum yield of the CsPbBr3 perovskite QDs is enhanced from 70% to 95% with increasing radiation pressure. Such enhancement is attributed to the increased binding energy of self-trapped excitons(STEs) upon radiation pressure, which is consistent with its blue-shifted PL and other characterization results. Furthermore, we study ultrafast absorption spectroscopy and find that the dynamics of relaxation from free excitons to STEs in radiation pressure CsPbBr3 QDs is ascribed to stronger electron–phonon coupling in the contracted octahedral structure. It is further demonstrated that radiation pressure can boost the PL efficiency and explore effectively the relationship between the structure and optical properties. | YING ZHANG HAIOU ZHU TAIWU HUANG ZONGPENG SONG SHUANGCHEN RUAN | 2019 | Photonics Research2019，7，8： | 2 |
| 2 | Infection-responsive long-term antibacterial bone plates for open fracture therapy显示文摘The infections in open fracture induce high morbidity worldwide.Thus,developing efficient anti-infective orthopedic devices is of great significance.In this work,we designed a kind of infection-responsive long-term antibacterial bone plates.Through a facile and flexible volatilization method,a multi-aldehyde polysaccharide derivative,oxidized sodium alginate,was crosslinked with multi-amino compounds,gentamycin and gelatin,to fabricate a uniform coating on Ti bone plates via Schiff base reaction,which was followed by a secondary crosslinking process by glutaraldehyde.The double-crosslinked coating was stable under normal condition,and could responsively release gentamycin by the triggering of the acidic microenvironment caused by bacterial metabolism,owning to the pH-responsiveness of imine structure.The thickness of the coating was ranging from 22.0μm to 63.6μm.The coated bone plates(Ti-GOGs)showed infection-triggered antibacterial properties(>99%)and high biocompatibility.After being soaked for five months,it still possessed efficient antibacterial ability,showing its sustainable antibacterial performance.The in vivo anti-infection ability was demonstrated by an animal model of infection after fracture fixation(IAFF).At the early stage of IAFF,Ti-GOGs could inhibit the bacterial infection(>99%).Subsequently,Ti-GOGs could promote recovery of fracture of IAFF.This work provides a convenient and universal strategy for fabrication of various antibacterial orthopedic devices,which is promising to prevent and treat IAFF. | Lujiao Zhang Yurun Yang Yan-Hua Xiong Yu-Qing Zhao Zongpeng Xiu Hui-Min Ren Kai Zhang Shun Duan Ying Chen Fu-Jian Xu | 2023 | Bioactive Materials2023，，7： | 2 |
| 3 | Copper-catalyzed asymmetric 1,3-dipolar cycloaddition of azomethine ylides withβ-trifluoromethyl-substituted alkenyl heteroarenes显示文摘Copper-catalyzed asymmetric 1,3-dipolar cycloaddition of azomethine ylides andβ-trifluoromethyl-substituted alkenyl heteroarenes was developed for the first time.A wide range of enantioenriched pyrrolidines containing both heteroarenes and trifluoromethyl group with multiple stereogenic centers could be readily accessible by this method with good to high yields and excellent levels of both stereo-and regioselectivity(up to 99%yield,>20:1 rr,>20:1 dr,and up to 95%ee).Notably,substratecontrolled umpolung-type dipolar cycloaddition was also disclosed in this protocol to achieve regiodivergent synthesis withα-aryl substituted aldimine esters as the dipole precursors.Systematic DFT studies were conducted to explore the origin of the stereo-and regioselectivity of this 1,3-dipolar cycloaddition,and suggest that copper(Ⅱ)salt utilized in this catalytic system could be reduced in-situ to the active copper(Ⅰ)species and might be responsible for the observed high stereo-and regioselectivity. | Xiang Cheng Xin Chang Yuhong Yang Zongpeng Zhang Jing Li Yipu Li Wenxiao Zhao Lung Wa Chung Huailong Teng Xiu-Qin Dong Chun-Jiang Wang | 2023 | Science China Chemistry2023，66，11： | 0 |
| 4 | High activity and stability in Ni_(2)P/(Co,Ni)OOH heterointerface with a multiple-hierarchy structure for alkaline hydrogen evolution reaction显示文摘The fabrication of heterointerface materials with hierarchical morphologies more than two levels is a challenging yet promising approach to achieve optimal electrocatalyst for hydrogen evolution reaction(HER).Here,using a facile two-step method,we are able to prepare the Ni_(2)P/(Co,Ni)OOH heterointerface with a three-level hierarchy morphology.The multiple levels of hierarchy structures not only offer considerable area for active sites loading,but also facilitate the substance transportation,both beneficial for HER.Meanwhile,the strong charge transfer at the Ni_(2)P/(Co,Ni)OOH heterointerface eliminates the spin asymmetry and achieves the thermos-neutral adsorption of active H species.Moreover,the resulted Coulomb attraction stacks the two materials firmly,facilitating the stability.Density functional theory(DFT)and in-situ Raman measurements reveal the sufficient Ni atoms acting as the active sites.With these merits,the Ni_(2)P/(Co,Ni)OOH exhibits much better HER activity than the separate Ni_(2)P or(Co,Ni)OOH,affording a current density of 100 mA/cm^(2)at an overpotential of 169 mV and a Tafel slope of 41 mV/dec,when tested in alkaline electrolyte.This work provides inspiration for optimizing the intrinsic HER activity utilizing multiple-level hierarchy structures. | LiLi Zhang Zongpeng Wang Jitang Zhang Zhiping Lin Qinghua Zhang Wenwu Zhong Guangfeng Wu | 2023 | Nano Research2023，16，5： | 0 |
| 5 | Stereodivergent Synthesis of Carbocyclic Quaternary α-Amino Acid Derivatives Containing Two Contiguous Stereocenters显示文摘A novel approach to stereodivergent synthesis of carbocyclicα-quaternary amino acid derivatives,bearing two contiguous stereocenters,is proposed through sequential dual Cu/Ir-catalyzed asymmetric allylation and ring-closing metathesis.A variety of five and six-membered carbocyclicα-quaternary amino acid derivatives could be readily achieved in good to high yields with exclusive regioselectivities,excellent diastereoselectivities(13:1->20:1 dr)and enantioselectivities(generally>99%ee).Of particular note is that the current protocol is also a versatile synthetic tool for the stereodivergent construction of the challenging seven and eight-membered carbocyclicα-amino acid derivatives.All four stereoisomers of these important molecules could be precisely synthesized through the permutation of chiral Cu/Ir catalytic system.The power of this strategy has been demonstrated for the facile access to some biologically active chiral molecules,such as spiro-hydantoins. | Cong Fu Qi Xiong Lu Xiao Ling He Tian Bai Zongpeng Zhang Xiu-Qin Dong Chun-Jiang Wang | 2022 | Chinese Journal of Chemistry2022，40，9： | 0 |
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