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Lateral composition-graded semiconductor nanoribbons for multi-color nanolasers

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Nano Research 2016年第4期9卷 933-941页

作者： xiujuan zhuang Pengfei Guo Qinglin Zhang Huawei Liu Dan Li Wei Hu Xiaoli Zhu Hong Zhou Anlian Pan Key Laboratory for Micro-Nano Physics and Technology of Hunan Province Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education School of Physics and electronics Hunan University Changsha 410082 China

Low-dimensional semiconductor nanostructures have attracted much interest for applications in integrated photonic and optoelectronic devices. Band gap engineering within single semiconductor nanoribbons helps to manipulate photon behavior in two different cavities （in the width and length directions） and realize new photonic phenomena and applications. In this work, lateral composition-graded semiconductor nanoribbons were grown for the first time through an improved source-moving vapor phase route. Along the width of the nanoribbon, the material can be gradually tuned from pure CdS to a highly Se-doped CdSSe alloy with a corresponding band gap modulation from 2.42 to 1.94 eV. The achieved alloy ribbons are overall high-quality crystals, and the position-dependent band-edge photoluminescence （PL） emission had a peak wavelength continuously tuned from -515 to -640 nm. These ribbons can realize multi-color lasing with three groups of lasing modes centered at 519, 557, and 623 run. It was confirmed that the red lasing was from optical resonance along the length direction, while the green and yellow lasing was from optical resonance along the width direction. These novel nanoribbon structures may be applied to many integrated photonic and optoelectronic devices.

关键词： composition grade semiconductor nanoribbon nanolaser multi-color

Highly stable lead-free Cs3Bi2I9 perovskite nanoplates for photodetection applications

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Nano Research 2019年第8期12卷 1894-1899页

作者： Zhaoyang Qi Xianwei Fu Tiefeng Yang Dong Li Peng Fan Honglai Li Feng Jiang Lihui Li Ziyu Luo xiujuan zhuang Anlian Pan Key Laboratory for Micro-Nano Physics and Technology of Hunan Province College of Materials and EngineeringSchool of Physics and Electronic Scienceand State Key Laboratory of Chemo/Biosensing and ChemometricsHunan UniversityChangsha 410082China

Lead halide perovskites have received tremendous attentions recently for their excellent properties such as high light absorption coefficient and long charge carrier diffusion length. However, the stability issues and the existence of toxic lead cations have largely limited their applications in optoelectronic area. Herein, we report the synthesis and investigation of highly stable and lead-free Cs3Bi2I9 perovskite nanoplates for visible light photodetection applications. The Cs3Bi2I9 nanoplates were synthesized through a facile solution-processed method, which is also applicable to various substrates. The achieved nanoplates present very good crystal quality and exhibit excellent long-term stability even exposed in moist air for several months. Photodetectors were constructed based on these high-quality perovskite nanoplates for the first time, and display a maximum photoresponsivity of 33.1 mA/W under the illumination of 450 nm laser, which is six times higher than the solution-synthesized CH3NH3PbI3 nanowire photodetectors. The specific detectivity of these devices can reach up to 10^10 Jones. Additionally, the devices exhibit fast rise and decay time of 10.2 and 37.2 ms, respectively, and highly stable photoswitching behavior with their photoresponse well retaining under alternating light and darkness. This work opens up a new opportunity for stable and low-toxic perovskite-based optoelectronic applications.

关键词： bismuth inorganic perovskite lead-free highly stable nanoplates photodetector

Cesium lead halide perovskite triangular nanorods as high-gain medium and effective cavities for multiphoton- pumped lasing

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Nano Research 2017年第10期10卷 3385-3395页

作者： Xiaoxia Wang Hong Zhou Shuangping Yuan Weihao Zheng Ying Jiang xiujuan zhuang Hongjun Liu Qinglin Zhang Xiaoli Zhu Xiao Wang Anlian Pan School of Physics and Electronics Key Laboratory for Micro-Nano Physics and Technology of Hunan Province and State Key Laboratory of Chemo/Biosensing and Chemometrics Hunan University Changsha 410082 China Institute of Physical and Theoretical Chemistry University of Tübingen Aufder Morgenstelle 18 72076 Tübingen Germany

High-performance multiphoton-pumped lasers based on cesium lead halide perovskite nanostructures are promising for nonlinear optics and practical frequency upconversion devices in integrated photonics. However, the performance of such lasers is highly dependent on the quality of the material and cavity, which makes their fabrication challenging. Herein, we demonstrate that cesium lead halide perovskite triangular nanorods fabricated via vapor methods can serve as gain media and effective cavities for multiphoton-pumped lasers. We observed blue-shifts of the lasing modes in the excitation fluence-dependent lasing spectra at increased excitation powers, which fits well with the dynamics of Burstein-Moss shifts caused by the band filling effect. Moreover, efficient multiphoton lasing in CsPbBr3 nanorods can be realized in a wide excitation wavelength range （700-1,400 nm）. The dynamics of multiphoton lasing were investigated by time-resolved photoluminescence spectroscopy, which indicated that an electron-hole plasma is responsible for the multiphoton-pumped lasing. This work could lead to new opportunities and applications for cesium lead halide perovskite nanostructures in frequency upconversion lasing devices and optical interconnect systems.

关键词： cesium lead halide perovskite nanorods triangular cross-section multiphoton-pumped laser time-resolved photoluminescence

Synthesis and Diameter-dependent Thermal Conductivity of InAs Nanowires

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Nano-Micro Letters 2014年第4期6卷 301-306页

作者： Pinyun Ren Xiaoli Zhu Jinyun Han Jinyou Xu Liang Ma Honglai Li xiujuan zhuang Hong Zhou Qinglin Zhang Minggang Xia Anlian Pan Key Laboratory for Micro-Nano Physics and Technology of Hunan Province State Key Laboratory of Chemo/Biosensing and Chemometrics College of Physics and Microelectronics Science Hunan University Condensed Matter Physics Laboratory Center on Experimental Physics School of Science Xi’an Jiaotong University

In this work, we synthesized high-quality In As nanowires by a convenient chemical vapor deposition method,and developed a simple laser heating method to measure the thermal conductivity of a single In As nanowire in air. During the measurement, a focused laser was used to heat one end of a freely suspended nanowire, with its other end embedded into a carbon conductive adhesive. In order to obtain the thermal conductivity of In As nanowires, the heat loss in the heat transfer process was estimated, which includes the heat loss through air conduction, the heat convection, and the radiation loss. The absorption ratio of the laser power in the In As nanowire was calculated. The result shows that the thermal conductivity of In As nanowires monotonically increases from 6.4 W m-1K-1to 10.5 W m-1K-1with diameters increasing from 100 nm to 190 nm, which is ascribed to the enhanced phonon-boundary scattering.

关键词： InAs nanowires Chemical vapor deposition Thermal conductivity Phonon-boundary scattering

Single-Crystalline In Ga As Nanowires for Room-Temperature High-Performance Near-Infrared Photodetectors

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Nano-Micro Letters 2016年第1期8卷 29-35页

作者： Huang Tan Chao Fan Liang Ma Xuehong Zhang Peng Fan Yankun Yang Wei Hu Hong Zhou xiujuan zhuang Xiaoli Zhu Anlian Pan Key Laboratory for Micro-Nano Physics and Technology of Hunan Province School of Physics and Electronics and State Key Laboratory of Chemo/Biosensing and ChemometricsHunan University

In Ga As is an important bandgap-variable ternary semiconductor which has wide applications in electronics and optoelectronics. In this work, single-crystal In Ga As nanowires were synthesized by a chemical vapor deposition *** measurements indicate the In Ga As nanowires have strong light emission in near-infrared region. For the first time, photodetector based on as-grown In Ga As nanowires was also constructed. It shows good light response over a broad spectral range in infrared region with responsivity of 6.5×10~3 AW^(-1) and external quantum efficiency of 5.04×10~5%. This photodetector may have potential applications in integrated optoelectronic devices and systems.

关键词： InGaAs Nanowire Near-infrared Photodetector

凝血功能和内环境监测在新生儿高胆红素血症换血治疗过程中的作用

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安徽医药 2017年第12期21卷 2218-2221页

作者：庄秀娟海南医学院第二附属医院儿科二区海南海口570311

目的探讨凝血功能和内环境监测在新生儿高胆红素血症换血治疗过程中的作用。方法收集108例新生儿高胆红素血症换血患儿进行回顾性分析,所有患儿均采用外周动静脉全自动同步换血疗法,将其分为观察组(58例)和对照组(50例),其中对照组采取... 详细信息

目的探讨凝血功能和内环境监测在新生儿高胆红素血症换血治疗过程中的作用。方法收集108例新生儿高胆红素血症换血患儿进行回顾性分析,所有患儿均采用外周动静脉全自动同步换血疗法,将其分为观察组(58例)和对照组(50例),其中对照组采取术中常规监测,而观察组在对照组的基础上采取凝血功能和内环境(血气)监测,且在换血前后从外周同一静脉抽血测定生化指标K^+、Na^+、Cl^-、Ca^(2+)、Mg^(2+)离子;凝血因子:活化的部分凝血活酶时间(APTT)、凝血酶原时间(PT)、凝血酶时间(TT)、纤维蛋白原(FIB)指标;血气氧分压[p(O_2)]、二氧化碳分压[p(CO_2)]、pH指标。比较两组患儿换血前和换血后生化指标、血气指标、凝血因子、免疫状态(CD3^+、CD3^+CD4^+、CD4^+/CD8^+)各项数据变化情况。结果换血后,两组患儿同换血前比较,对照组血清K^+、Na^+、Cl^-、Ca^(2+)、Mg^(2+)离子的变化无明显变化,观察组的K^+、Na^+、Cl^-变化亦不大,但Ca^(2+)、Mg^(2+)离子的变化较大;组间比较,换血后Ca^(2+)、Mg^(2+)离子有显著的变化(P<0.05),而p(O_2)、p(CO_2)比较差异无统计学意义;观察组与对照组换血前后BE的变化较大,且观察组的pH值在换血前后也有大幅变化。观察组换血后较换血前凝血四项异常人数占比均偏低,而对照组仅两项有降低无明显改变;换血后观察组CD3^+、CD3^+CD4^+、CD4^+/CD8^+与治疗前比较均升高(P<0.05);而对照组治疗后CD3^+、CD3^+CD4^+、CD4^+/CD8+均无明显变化。结论外周动静脉全自动同步换血疗法治疗新生儿高胆红素血症对机体血气分析、内环境及凝血常规有一定影响,治疗安全有效,但这些影响不对新生儿构成生命危险。

关键词：凝血功能内环境新生儿高胆红素血症换血疗法

Light-triggered interfacial charge transfer and enhanced photodetection in CdSe/ZnS quantum dots/MoS_(2)mixed-dimensional phototransistors

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Opto-Electronic Advances 2021年第9期4卷 28-38页

作者： Ziwei Li Wen Yang Ming Huang Xin Yang Chenguang Zhu Chenglin He Lihui Li Yajuan Wang Yunfei Xie Zhuoran Luo Delang Liang Jianhua Huang Xiaoli Zhu xiujuan zhuang Dong Li Anlian Pan Key Laboratory for Micro-Nano Physics and Technology of Hunan Province College of Materials Science and EngineeringSchool of Physics and ElectronicsHunan UniversityChangsha 410082China

Mix-dimensional van der Waals heterostructures(vdWHs)have inspired worldwide interests and efforts in the field of ad-vanced electronics and *** fundamental understanding of interfacial charge transfer is of vital import-ance for guiding the design of functional optoelectronic *** this work,type-Ⅱ0D-2D CdSe/ZnS quantum dots/MoS_(2)vdWHs are designed to study the light-triggered interfacial charge behaviors and enhanced optoelectronic *** spectral measurements in both steady and transient states,the phenomena of suppressed photolu-minescence(PL)emissions,shifted Raman signals and changed PL lifetimes provide strong evidences of efficient charge transfer at the 0D-2D interface.A series of spectral evolutions of heterostructures with various QDs overlapping concentrations at different laser powers are analyzed in details,which clarifies the dynamic competition between exciton and trion during an efficient doping of 3.9×10^(13)cm^(−2).The enhanced photoresponses(1.57×10^(4)A·W^(-1))and detectivities(2.86×10^(11)Jones)in 0D/2D phototransistors further demonstrate that the light-induced charge transfer is still a feasible way to optimize the performance of optoelectronic *** results are expected to inspire the basic understand-ing of interfacial physics at 0D/2D interfaces,and shed the light on promoting the development of mixed-dimensional op-toelectronic devices in the near future.

关键词： heterostructure phototransistor MoS_(2) quantum dots

血清miR-200c-3p表达水平对判断新生儿呼吸窘迫综合征严重程度和预后的价值

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临床儿科杂志 2020年第4期38卷 250-254页

作者：古裕鸟霍开明庄秀娟蒋家敏吴小红黄旭芳海南医学院第二附属医院儿科海南海口570311

目的探讨血清miR-200c-3p表达水平对判断新生儿呼吸窘迫综合征(NRDS)严重程度和预后的价值。方法选取2016年6月-2019年6月收治的102例NRDS新生儿,应用新生儿急性生理学评分围生期补充II(SNAPPE-II)评分进行评估。根据患儿生存情况分为... 详细信息

目的探讨血清miR-200c-3p表达水平对判断新生儿呼吸窘迫综合征(NRDS)严重程度和预后的价值。方法选取2016年6月-2019年6月收治的102例NRDS新生儿,应用新生儿急性生理学评分围生期补充II(SNAPPE-II)评分进行评估。根据患儿生存情况分为生存组(n=73)和死亡组(n=29),按照X线结果和病情严重程度分为轻度组(Ⅰ、Ⅱ级,67例)和重度组(Ⅲ、Ⅳ级,35例),采用实时荧光定量PCR检测各组血清miR-200c-3p表达水平。应用ROC曲线分析miR-200c-3p表达水平及SNAPPE-II评分预测NRDS患儿死亡的价值。结果死亡组血清miR-200c-3p表达水平及SNAPPE-II评分均明显高于生存组,重度组miR-200c-3p表达水平、SNAPPE-II评分及病死率高于轻度组,差异均有统计学意义(P<0.05)。ROC曲线分析显示,血清miR-200c-3p表达水平联合SNAPPE-II评分预测NRDS死亡的曲线下面积(AUC)为0.93(95%CI:0.87~0.98),明显高于单项miR-200c-3p(0.84,95%CI:0.78~0.90)及SNAPPE-II评分(0.80,95%CI:0.75~0.86),差异有统计学意义(P<0.05),其灵敏度和特异度为94.0%和88.5%。NRDS患儿血清miR-200c-3p表达水平与SNAPPE-II评分呈显著正相关(r=0.84,P<0.01)。结论血清miR-200c-3p表达水平升高与NRDS病情严重程度及预后相关,miR-200c-3p联合SNAPPE-II评分对NRDS预后判断具有较高价值。

关键词：新生儿呼吸窘迫综合征 miR-200c-3p 预后判断

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辛伐他汀抑制川畸病大鼠心肌损伤

中南医学科学杂志 2024年第1期52卷 36-39页

作者：姜虹羽庄秀娟蔡思铭岑红霞海南医学院第二附属医院儿科二区海南海口570311

目的探讨辛伐他汀对川崎病大鼠心肌的影响及机制。方法随机将SD雄性大鼠分为对照组、模型组及辛伐他汀组,除对照组外其余两组均利用干酪素酸杆菌提取物构建大鼠川崎病心肌损伤模型。心脏超声及组织学切片观察辛伐他汀对大鼠心功能及心... 详细信息

目的探讨辛伐他汀对川崎病大鼠心肌的影响及机制。方法随机将SD雄性大鼠分为对照组、模型组及辛伐他汀组,除对照组外其余两组均利用干酪素酸杆菌提取物构建大鼠川崎病心肌损伤模型。心脏超声及组织学切片观察辛伐他汀对大鼠心功能及心肌结构的影响。ELISA试剂盒检测各组血清中心肌损伤指标及心肌组织炎症因子水平。免疫印迹法检测各组心肌组织中凋亡相关蛋白、高迁移率族蛋白B1(HMGB1)/晚期糖基化终末产物受体(RAGE)通路蛋白的表达水平。结果与对照组比较,模型组大鼠心功能指标水平、抗凋亡蛋白B细胞淋巴瘤-2(Bcl-2)表达显著下降,心肌组织炎症细胞浸润增加,炎症因子水平、促凋亡蛋白Bcl-2关联X蛋白及活化的Caspase-3、HMGB1/RAGE通路蛋白表达升高(P<0.05)。与模型组比较,辛伐他汀组以上各个指标均显著逆转(P<0.05)。结论辛伐他汀可抑制川崎病导致的大鼠心肌损伤,其机制可能与抑制HMGB1/RAGE信号通路有关。

关键词：辛伐他汀川崎病心肌损伤 HMGB1/RAGE