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Surface evolution of thermoelectric material KCu_(4)Se_(3) explored by scanning tunneling microscopy

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Chinese Physics B 2024年第8期33卷 422-427页

作者：夏玉敏马妮蔡德胜刘宇舟谷易通于淦霍思宇庞文慧肖翀秦胜勇 International Center for Quantum Design of Functional Materials(ICQD) Hefei National Laboratory for Physical Sciences at Microscale(HFNL)University of Science and Technology of ChinaHefei 230026China CAS Key Laboratory of Strong Coupled Quantum Matter Physics Department of PhysicsUniversity of Science and Technology of ChinaHefei 230026China Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of ChinaHefei 230026China Institute of Energy Hefei Comprehensive National Science CenterHefei 230031China Dalian National Laboratory for Clean Energy Chinese Academy of Sciences(CAS)Dalian 116023China Hefei National Laboratory University of Science and Technology of ChinaHefei 230088China

Novel two-dimensional thermoelectric materials have attracted significant attention in the field of thermoelectric due to their low lattice thermal conductivity.A comprehensive understanding of their microscopic structures is crucial for driving further the optimization of materials properties and developing novel functional ***,by using in situ scanning tunneling microscopy,we report the atomic layer evolution and surface reconstruction on the cleaved thermoelectric material KCu_(4)Se_(3) for the first *** clearly revealed each atomic layer,including the naturally cleaved K atomic layer,the intermediate Se^(2-)atomic layer,and the Se^(-)atomic layer that emerges in the thermodynamic-stable *** from the maj ority of studies that predominantly concentrate on macroscopic measurements of the charge transport,our results reveal the coexistence of potassium disorder and complex reconstructed patterns of selenium,which potentially influences charge carrier and lattice *** results provide direct insight into the surface microstructures and evolution of KCu_(4)Se_(3),and shed useful light on designing functional materials with superior performance.

关键词： thermoelectric KCu_(4)Se_(3) scanning tunneling microscopy(STM) evolution

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Strategies for discovery and optimization of thermoelectric materials： Role of real objects and local fields

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Frontiers of physics 2018年第3期13卷 9-16页

作者： Hao Zhu chong Xiao Hefei National Laboratory for Physical Sciences at the Microscale University of Science & Technology of China Hefei 230026 China

Thermoelectric materials provide a renewable and eco-friendly solution to mitigate energy shortages and to reduce environmental pollution via direct heat-to-electricity conversion. Discovery of the novel thermoelectric materials and optimization of the state-of-the-art material systems lie at the core of the thermoelectric society, the basic concept behind these being comprehension and manipulation of the physical principles and transport properties regarding thermoelectric materials. In this mini-review, certain examples for designing high-performance bulk thermoelectric materials are presented from the perspectives of both real objects and local fields. The highlights of this topic involve the Rashba effect, Peierls distortion, local magnetic field, and local stress field, which cover several aspects in the field of thermoelectric research. We conclude with an overview of future developments in thermoelectricity.

关键词： thermoelectric materials real objects local fields

Improved thermoelectric performance in n-type BiTe facilitated by defect engineering

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Rare Metals 2021年第10期40卷 2829-2837页

作者： Hao Zhu Ji-Yin Zhao chong Xiao Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of ChinaHefei 230026China

BiTe is a potentially attractive candidate for thermoelectric applications because it is the structural analogue of the state-of-the-art thermoelectric material,bismuth telluride(Bi_(2)Te_(3)). However, BiTe has attracted little attention due to its small band gap and high electron concentration. In this study, remarkable increase in thermoelectric performance in the n-type Bi_(1-x)Sb_(x)Te compounds through tuning the carrier concentration with chemical doping is shown. The Seebeck coefficient of Bi_(1-x)Sb_(x)Te increases remarkably while the electronic thermal conductivity decreases gradually as Sb content is increased, leading to enhanced thermoelectric figure of merit(ZT). Moreover, the simultaneous optimization of the electrical and thermal transport properties leads the peak temperature of the figure of merit to shift toward lower temperature with Sb content increasing in Bi_(1-x)Sb_(x)Te, thus making Bi_(1-x)Sb_(x)Te a potential alternative to bismuth telluride for near-room-temperature thermoelectric applications. In addition, the presence of multiple low-frequency optical phonons and their coupling with the long-wavelength heat carrying acoustic phonons in all the Bi_(1-x)Sb_(x)Te investigated are revealed based on the combined Debye-Einstein model. The present results provide the underlying mechanism connecting thermoelectric performance and lattice dynamics in Bi_(1-x)Sb_(x)Te compounds.

关键词： BiTe Thermoelectric material Carrier concentration Defect engineering Einstein oscillators Near-room-temperature application

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Effect of oral Lactococcus lactis containing endostatin on 1, 2-dimethylhydrazine-induced colon tumor in rats

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World Journal of Gastroenterology 2005年第46期11卷 7242-7247页

作者： Wei Li chong-Bi Li Department of Obstetrics and Gynecology First People's Hospital of Hangzhou Hangzhou 310006 Zhejiang ProvinceChina Department of Biology Zhaoqing CollegeZhaoqing 526000 Guangdong Province China

AIM： To investigate the effects of oral Lactococcus lactis （L lactis） containing endostatin on 1, 2-dimethylhydrazine （DMH）-induced rat colorectal cancer. METHODS： Recombinant endostatin was produced by the expression of L lactis NZ9000. Sixty male Wistar rats were injected with DMH （40 mg/kg body weight） subcutaneously once a week for 10 wk to induce colorectal cancer. The rats were gavaged with 1 mL of endostatin at a dose of 1×10^8/d and fed with the basal diet. The animals were killed after 22 wk for histopathological examination. The total time of experimental observation was 58 wk. RESULTS： Rat endostatin protein was expressed in L lactis. Recombinant endostatin exhibited a significant effect on colorectal cancer （P〈0.05）. Furthermore, the mean survival time of the rats treated with endostatin was longer than that of the animals treated with DMH. There was no statistically significant difference between the rats treated with endostatin and those treated with DMH. The results showed that endostatin could not result in complete cure. CONCLUSION： Oral endostatin exerts an influence on the progression of chemically induced colon tumors.

关键词： Endostatin DMH Tumors

Results of intravitreal dexamethasone implant 0.7 mg (Ozurdex^(█)) in non-infectious posterior uveitis

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International Journal of Ophthalmology(English edition) 2015年第4期8卷 835-838页

作者： Yew chong Yap Thomas Papathomas Ahmed Kamal Department of Ophthalmology University Hospital Aintree

· AIM: To evaluate the safety and efficacy of dexamethasone implant in patients with non-infectious posterior uveitis with cystoid macular edema(CME).·METHODS: Retrospective analysis of patients reports with CME secondary to non-infectious uveitis treated with dexamethasone implant. Data included type of posterior uveitis, any systemic immunosuppressive therapy, Early Treatment Diabetic Retinopathy Study(ETDRS) best-corrected visual acuity(BCVA), central macular thickness(CMT) on optical coherence tomography(OCT) and signs of intraocular inflammation at baseline and then at 2wk postoperatively and monthly thereafter. Follow-up is up to 10 mo. Any per-operative and post-operative complications were recorded.·RESULTS: Six eyes of 4 patients with CME due to non-infectious posterior uveitis treated with dexamethasone implant. Diagnosis included idiopathic panuveitis, birdshot chorioretinopathy and idiopathic intermediate uveitis. At baseline mean ETDRS BCVA was63 letters and mean CMT 556 μm at 2wk postoperatively mean ETDRS BCVA improved to 70 letters and mean CMT decreased to 329 μm. All eyes showed clinical evidence of decreased inflammation. The duration of effect of the implant was 5 to 6mo and retreatment was required in 2 eyes. Two patients required antiglaucoma therapy for increased intraocular pressures.·CONCLUSION: In patients with non-infectious posterior uveitis dexamethasone implant can be a short-term effective treatment option for controlling intraocular inflammation.

关键词： Ozurdex~? cystoids macular oedema central macular thickness posterior uveitis

Defects Engineering with Multiple Dimensions in Thermoelectric Materials

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Research 2020年第1期2020卷 1898-1920页

作者： Chenxi Zhao Zhou Li Tianjiao Fan chong Xiao Yi Xie Hefei National Laboratory for Physical Sciences at Microscale CAS Center for Excellence in NanoscienceUniversity of Science&Technology of ChinaHefeiAnhui 230026China Institute of Energy Hefei Comprehensive National Science CenterHefeiAnhui 230031China

Going through decades of development,great progress in both theory and experiment has been achieved in thermoelectric *** the growing enhancement in thermoelectric performance,it is also companied with the complexation of defects induced in the materials.0D point defects,1D linear defects,2D planar defects,and 3D bulk defects have all been induced in thermoelectric materials for the optimization of thermoelectric *** the distinct characteristics of each type of defects,in-depth understanding of their roles in the thermoelectric transport process is of vital *** this paper,we classify and summarize the defect-related physical effects on both band structure and transport behavior of carriers and phonons when inducing different types of *** achievements in experimental characterization and theoretical simulation of defects are also summarized for accurately determining the type of defects serving for the design of thermoelectric ***,based on the current theoretical and experimental achievements,strategies engaged with multiple dimensional defects are reviewed for thermoelectric performance optimization.

关键词： materials defects Defects

Programmed cell death-1 inhibitor combination treatment for recurrent proficient mismatch repair/miscrosatellite-stable type endometrial cancer:A case report

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World Journal of Clinical Cases 2022年第21期10卷 7474-7482页

作者： chong-Ya Zhai Lu-Xi Yin Wei-Dong Han Department of Medical Oncology Xiasha CampusSir Run Run Shaw HospitalCollege of MedicineZhejiang UniversityHangzhou 310020Zhejiang ProvinceChina Department of Medical Oncology Sir Run Run Shaw HospitalCollege of MedicineZhejiang UniversityHangzhou 310020Zhejiang ProvinceChina

BACKGROUND Endometrial cancer(EC)is one of the most common cancers of the female reproductive tract,and the incidence is increasing *** using programmed cell death-1(PD-1)inhibitors is an emerging research topic and treatment strategy for refractory gynecological ***,clinical management of EC with checkpoint inhibitors requires ***,we discuss a case of refractory proficient mismatch repair(pMMR)/miscrosatellitestable(MSS)EC treated with a combination of PD-1 and angiogenesis inhibitors and offer a review of the pathophysiology and clinical outcomes based on previous *** SUMMARY A 62-year-old woman diagnosed with invasive or metastatic EC in 2015 was treated with six courses of chemotherapy and refused further *** years later,she developed chest pain,and lung biopsy indicated thyroid transcription factor-1(-),Napsin A(-),estrogen receptor(+),progesterone receptor(+),anaplastic lymphoma kinase(D5F3)(-),and receptor tyrosine kinase(D4D6)(-)metastatic *** testing results showed low tumor mutation burden,pMMR,PD ligand 1(-),MSS,and HLA-class 1 heterogeneous *** patient was started on toripalimab combined with nab-paclitaxel for seven cycles(every 3 wk),but this regimen was terminated because of an intolerable chemotherapy adverse *** disease progressed in 2020,and the patient’s treatment was switched from nab-paclitaxel to anlotinib,while immunotherapy using toripalimab was *** patient achieved a major partial response with well-tolerated toxicities,and treatment is *** Molecular testing is advised for clinical classifications of EC owing to its high *** this case,the patient had pMMR/MSS EC and achieved a positive outcome with combination PD-1 inhibitor *** results warrant further clinical exploration.

关键词： Refractory endometrial cancer Proficient mismatch repair Miscrosatellite-stable Immunotherapy Case report

Efficient interlayer charge release for high-performance layered thermoelectrics

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National Science Review 2021年第2期8卷 115-122页

作者： Hao Zhu Zhou Li Chenxi Zhao Xingxing Li Jinlong Yang chong Xiao Yi Xie Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of China Institute of Energy Hefei Comprehensive National Science Center Department of Chemical Physics Hefei National Laboratory for Physical Sciences at the Microscale and Synergetic Innovation Center of Quantum Information & Quantum PhysicsUniversity of Science and Technology of China

Many layered superlattice materials intrinsically possess large Seebeck coefficient and low lattice thermal conductivity, but poor electrical conductivity because of the interlayer transport barrier for charges, which has become a stumbling block for achieving high thermoelectric performance. Herein, taking Bi Cu Se O superlattice as an example, it is demonstrated that efficient interlayer charge release can increase carrier concentration, thereby activating multiple Fermi pockets through Bi/Cu dual vacancies and Pb *** results reveal that the extrinsic charges, which are introduced by Pb and initially trapped in the charge-reservoir [BiO]sublayers, are effectively released into [CuSe]sublayers via the channels bridged by Bi/Cu dual vacancies. This efficient interlayer charge release endows dual-vacancy-and Pb-codoped Bi Cu Se O with increased carrier concentration and electrical conductivity. Moreover, with increasing carrier concentration, the Fermi level is pushed down, activating multiple converged valence bands, which helps to maintain a relatively high Seebeck coefficient and yield an enhanced power factor. As a result, a high ZT value of 1.4 is achieved at 823 K in codoped BiPbCuSeO, which is superior to that of pristine Bi Cu Se O and solely doped samples. The present findings provide prospective insights into the exploration of high-performance thermoelectric materials and the underlying transport physics.

关键词： layered superlattice material interlayer charge release carrier concentration thermoelectric performance

Tuning the electric transport behavior of AgCrSe_(2) by intrinsic defects

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Science China Chemistry 2021年第11期64卷 1970-1975页

作者： Yang Hua Wei Bai Sheng Wang Yunbo Wu Shengtao Cui Zhe Sun chong Xiao Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of ChinaHefei230026China Institute of Energy Hefei Comprehensive National Science CenterHefei230031China National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefei230029China

The two-dimensional(2 D)structure often leads to unusual phenomena for the impact of confined mean free path of carrier *** a quasi-2 D layered material,Ag CrSe_(2)has a liquid-like phonon behavior for its unstable Ag atoms at service temperature,leading to the promising candidate for thermoelectricity and fast ionic ***,the inferior electronic performance constrains its application prospects as a functional semiconductor,which provides broad opportunity to tune its electric behaviors by defect *** this work,we revealed abundant electric transport behaviors of Ag CrSe_(2)with different types of intrinsic *** example,the Ag CrSe_(2)changes from Anderson insulator to metal when Se defects become prevailing and the magnetoresistance alters its sign depending on the relative ratio of Ag and Cr *** results reported here can give salutary boosting on regulating the electric properties of ternary transition metal selenide by defect chemistry.

关键词： electric transport defect layered material

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