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学者姓名：张新平
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摘要 ：
We report the direct laser writing (DLW) of surface-enhanced Raman scattering (SERS) structures on the inner wall of a hollow fiber. Colloidal gold-silver alloy nanoparticles (Au-Ag ANPs) are firstly coated onto the inner wall of a hollow fiber. A green laser beam is focused through the outer surface of the hollow fiber to interact with colloidal Au-Ag ANPs so that they become melted and aggregated on the surface of the inner wall with strong adhesion. Such randomly distributed plasmonic nanostructures with high density and small gaps favor the SERS detection of low-concentration molecules in liquids flowing through the hollow fiber. Such a SERS device also supplies a three-dimensional microcavity for the interaction between excitation laser and the target molecules. The DLW system consists mainly of the flexible connection between the motor shaft and the hollow fiber, the program-controlled translation of the hollow fiber along its symmetric axis and rotation about the axis, as well as the mechanical design and the computer control system. This DLW technique enables high production, high stability, high reproducibility, high precision, and a high-flexibility fabrication of the hollow fiber SERS device. The resultant microcavity SERS scheme enables the high-sensitivity detection of R6G molecules in ethanol with a concentration of 10(-7) mol/L.
关键词 ：
inner wall inner wall surface-enhanced Raman scattering surface-enhanced Raman scattering direct laser writing direct laser writing hollow fiber hollow fiber sensors for flowing liquids sensors for flowing liquids
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| GB/T 7714 | Li, Jiajun , Mu, Yunyun , Liu, Miao et al. Direct Laser Writing of SERS Hollow Fibers [J]. | NANOMATERIALS , 2022 , 12 (16) . |
| MLA | Li, Jiajun et al. "Direct Laser Writing of SERS Hollow Fibers" . | NANOMATERIALS 12 . 16 (2022) . |
| APA | Li, Jiajun , Mu, Yunyun , Liu, Miao , Zhang, Xinping . Direct Laser Writing of SERS Hollow Fibers . | NANOMATERIALS , 2022 , 12 (16) . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Organic semiconductors exhibit strong optical nonlinearity and can be utilized in optical modulation schemes. However, the response speed of such materials is limited by the lifetime of the largely delocalized pi-electrons, in particular for application in Kerr type optical switching devices. We report here a thin-film optical switch with a response time shorter than 300 fs in a single-layer poly[(9,9-dioctylfluorenyl-2,7-diyl)-co-(N,N '-diphenyl)-N,N '-di(p-butylphenyl)-1,4-diamino-benzene)] (PFB), where the unique band structure of PFB that allows strong transient two-photon absorption with high contrast is the main responsible mechanism. The exciton absorption from the bottom of the conduction band to the higher-lying bands is bleached through further excitation by the pump pulses, which induces charge dissociation on higher-lying excited states and largely enhances the contrast of the optical switching signal. The findings here not only supply new insights into the photoelectronics of the conventional polyfluorene semiconductors, but also explore new applications of such organic thin-film materials in nonlinear optics and optical modulation devices.
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| GB/T 7714 | Fu, Yulan , Wang, Jiawei , Zhang, Yiwei et al. A femtosecond optical switch using molecular two-photon absorption with multi-step charge dissociation [J]. | JOURNAL OF MATERIALS CHEMISTRY C , 2022 , 10 (17) : 6812-6817 . |
| MLA | Fu, Yulan et al. "A femtosecond optical switch using molecular two-photon absorption with multi-step charge dissociation" . | JOURNAL OF MATERIALS CHEMISTRY C 10 . 17 (2022) : 6812-6817 . |
| APA | Fu, Yulan , Wang, Jiawei , Zhang, Yiwei , Zhang, Xinping . A femtosecond optical switch using molecular two-photon absorption with multi-step charge dissociation . | JOURNAL OF MATERIALS CHEMISTRY C , 2022 , 10 (17) , 6812-6817 . |
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摘要 ：
Hydrates of hybrid organic-inorganic perovskites have been discovered with MAPbI(3) and are proved to be unstable in atmosphere. However, the influence of water molecules on the performance of optoelectronic devices is still not fully understood. Here, using a dication, 2-(dimethylamino) ethylamine (DMEN2+), a stable quasi-1D perovskitoid hydrate single crystal is designed and successfully synthesized, which is formulated as DMENPb2I6 center dot H2O. In this design, both corner-sharing and edge-sharing connectivity are adopted, and water molecules are connected with the crystal through hydrogen bonding. It is discovered that such water sites distributed along the inorganic chains function both as charge traps and as releasable charge stocks. Optical excitation that overcomes the potential wells formed on these water sites may release these stocked charges and facilitate enhanced transportable charge density. Meanwhile, exciton diffusion and charge transport are strongly confined in the 1D transport channels. Above mechanisms are verified both by the transient absorption spectroscopy and by the photodetection performance. This introduces a new design strategy with a trapping-stock-releasing-transport roadmap for perovskitoid materials. Excellent water resistance endows this material with more advantages in the development of a new generation of optoelectronic devices.
关键词 ：
1D single crystals 1D single crystals releasable charge traps releasable charge traps hydrates of hybrid organic-inorganic halide perovskitoid hydrates of hybrid organic-inorganic halide perovskitoid water resistant photodetectors water resistant photodetectors
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| GB/T 7714 | Zhang, Yiwei , Fu, Yulan , Song, Xiaoyan et al. Releasable Water Charge-Trapping and Water-Resistant Photodetection using 1D Perovskitoid Hydrate Single Crystal [J]. | ADVANCED MATERIALS , 2022 , 34 (36) . |
| MLA | Zhang, Yiwei et al. "Releasable Water Charge-Trapping and Water-Resistant Photodetection using 1D Perovskitoid Hydrate Single Crystal" . | ADVANCED MATERIALS 34 . 36 (2022) . |
| APA | Zhang, Yiwei , Fu, Yulan , Song, Xiaoyan , Zhang, Xinping . Releasable Water Charge-Trapping and Water-Resistant Photodetection using 1D Perovskitoid Hydrate Single Crystal . | ADVANCED MATERIALS , 2022 , 34 (36) . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Exciton dynamics significantly influences the performance of the optoelectronic devices, which is intensively studied in the light-emitting perovskite of CH3NH3PbBr3 (MAPbBr(3)). However, most of the existing investigations have focused on the free excitons. In this study, we investigate the emissive recombination from defect states in MAPbBr(3) using temperature-and excitation-dependent photoluminescence measurements. It is revealed that two emission peaks centered at about 550 and 590 nm are presented at temperatures as low as 10 K, instead of one peak at 535 nm for the observation at room temperature. These two peaks are attributed to the emission of bound excitons after self-absorption and bulk defects, respectively. It is found that the distribution of the bound and trapped excitons is strongly influenced by the morphology of the MAPbBr(3) films. These results provide deep insights into the exciton dynamics in MAPbBr(3), facilitating new physics for the design of related optoelectronic materials and devices.
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| GB/T 7714 | Hu, Jingyun , Zhang, Yiwei , Zhang, Xinping . Low-Temperature Discrimination of Defect States by Exciton Dynamics in Thin-Film MAPbBr(3) Perovskite [J]. | JOURNAL OF PHYSICAL CHEMISTRY LETTERS , 2022 , 13 (26) : 6093-6100 . |
| MLA | Hu, Jingyun et al. "Low-Temperature Discrimination of Defect States by Exciton Dynamics in Thin-Film MAPbBr(3) Perovskite" . | JOURNAL OF PHYSICAL CHEMISTRY LETTERS 13 . 26 (2022) : 6093-6100 . |
| APA | Hu, Jingyun , Zhang, Yiwei , Zhang, Xinping . Low-Temperature Discrimination of Defect States by Exciton Dynamics in Thin-Film MAPbBr(3) Perovskite . | JOURNAL OF PHYSICAL CHEMISTRY LETTERS , 2022 , 13 (26) , 6093-6100 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
<正>由于具有多激励、宽谱响应、插入损耗小和响应速度快等优势, VO_2是一种理想的THz波主动调制材料。但是,由于传统半导体基底存在缺乏柔性、热容大、热导率低和不导电等问题,在硬质基底上难以实现高性能VO_2基THz波主动调制器件。为解决上述问题,申请人将VO2生长在顺排CNT薄膜上。顺排CNT薄膜具有沿CNT轴向有序排列的特性。
关键词 ：
偏振方向 偏振方向 二氧化钒 二氧化钒 THz THz 太赫兹波调制器 太赫兹波调制器
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| GB/T 7714 | 马赫 , 王钰 , 张新平 . 超低激发阈值柔性二氧化钒太赫兹波调制器 [J]. | 量子电子学报 , 2021 , 38 (01) : 123 . |
| MLA | 马赫 et al. "超低激发阈值柔性二氧化钒太赫兹波调制器" . | 量子电子学报 38 . 01 (2021) : 123 . |
| APA | 马赫 , 王钰 , 张新平 . 超低激发阈值柔性二氧化钒太赫兹波调制器 . | 量子电子学报 , 2021 , 38 (01) , 123 . |
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摘要 ：
<正>有机太阳能电池中,活性层吸收光子后产生激子,激子扩散到给体、受体界面处实现分离,从而产生载流子,载流子传输到电极处被电极收集后产生光电流。其中激子扩散是有机太阳能电池产生光电流的重要环节,对器件效率有重要影响。本研究以时间分辨荧光光谱作为主要的研究工具,通过三种方法,分别研究了高效率有机太阳能电池给体和受体材料中的激子扩散过程。其中激子表面淬灭法是在交联的富勒烯材料和石英衬底上分别制备相同厚度的有机半导体给体薄膜,通过测量在不同衬底上的荧光寿命,得出由激子扩散导致的荧光淬灭,从而计算出激子的扩散长度。
关键词 ：
有机太阳能电池 有机太阳能电池 光谱学研究 光谱学研究 扩散长度 扩散长度
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| GB/T 7714 | 张一伟 , 张新平 . 高效有机太阳能电池中激子扩散超快光谱学研究 [J]. | 量子电子学报 , 2021 , 38 (01) : 126 . |
| MLA | 张一伟 et al. "高效有机太阳能电池中激子扩散超快光谱学研究" . | 量子电子学报 38 . 01 (2021) : 126 . |
| APA | 张一伟 , 张新平 . 高效有机太阳能电池中激子扩散超快光谱学研究 . | 量子电子学报 , 2021 , 38 (01) , 126 . |
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摘要 ：
基于空芯光纤内壁的SERS微腔结构及其激光加工方法，属于属于等离激元纳米光子学和传感器技术领域。提出了一种分布于空芯光纤内壁的三维等离激元纳米结构激光加工方法，工艺过程的自动控制和高效，激光直写加工可以批量制备新型SERS检测基底。空芯光纤SERS基底大大提高SERS检测信号的三维反馈与收集。
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| GB/T 7714 | 张新平 , 穆云云 , 李佳俊 et al. 基于空芯光纤内壁的SERS微腔结构及其激光加工方法 : CN202110045821.7[P]. | 2021-01-13 . |
| MLA | 张新平 et al. "基于空芯光纤内壁的SERS微腔结构及其激光加工方法" : CN202110045821.7. | 2021-01-13 . |
| APA | 张新平 , 穆云云 , 李佳俊 , 刘淼 . 基于空芯光纤内壁的SERS微腔结构及其激光加工方法 : CN202110045821.7. | 2021-01-13 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Due to their high flexibility and adaptability, bionic robots have great potential in applications such as healthcare, rescue, and surveillance. The flexible actuator is an essential component of the bionic robot and determines its performance. Even though much progress has been achieved in bionic robot research, there still exists a great challenge in preparing a flexible actuator with a large stroke, high sensitivity, fast response, low triggering power, and long lifetime. This study presents a flexible actuator based on a paraffin wax and Ti3C2Tx MXene (PW-MX) film composite. Such a flexible actuator delivers an excellent actuation performance, including a large curvature change (2.2 x 10(2) m(-1)), high thermal sensitivity (4.6 m(-1)/degrees C), low triggering power of light (76 mW/cm(2)), wavelength selectivity, fast response (0.38 s), and long lifetime (>20000 cycles). Due to the high thermal sensitivity and the strong infrared absorption of the PW-MX film, crawling motion of an inchworm robot based on PW-MX film can be triggered by infrared irradiation from the human finger. To mimic living organisms with bioluminescence, we prepared a PW-MX actuator with green fluorescence by doping PW-MX film with CdSe/ZnS quantum dots. The integration of luminescent function enables the PW-MX actuator to deliver information under light stimulation and to camouflage under a background of green foliage actively. With its merits of ease of fabrication and high actuation performance, the flexible PW-MX actuator is expected to lend itself to more applications in the future.
关键词 ：
bionic robots bionic robots camouflage camouflage flexible actuator flexible actuator information delivery information delivery MXene MXene paraffin wax paraffin wax phase transition phase transition
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| GB/T 7714 | Xiao, Xiao , Ma, He , Zhang, Xinping . Flexible Photodriven Actuator Based on Gradient-Paraffin-Wax-Filled Ti3C2Tx MXene Film for Bionic Robots [J]. | ACS NANO , 2021 , 15 (8) : 12826-12835 . |
| MLA | Xiao, Xiao et al. "Flexible Photodriven Actuator Based on Gradient-Paraffin-Wax-Filled Ti3C2Tx MXene Film for Bionic Robots" . | ACS NANO 15 . 8 (2021) : 12826-12835 . |
| APA | Xiao, Xiao , Ma, He , Zhang, Xinping . Flexible Photodriven Actuator Based on Gradient-Paraffin-Wax-Filled Ti3C2Tx MXene Film for Bionic Robots . | ACS NANO , 2021 , 15 (8) , 12826-12835 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Detection of low-concentration molecules in liquids has been a challenge in sensing technologies. Raman spectroscopy is an effective approach for trace detection, which is in fact a "volume-excitation" and "volume-collection" technique in the analysis of liquid samples. However, for the commonly employed one-pass excitation and back-scattering detection scheme, a large portion of both the excitation laser energy and the Raman-scattering light energy is wasted without efficient reuse or collection. In this consideration, we demonstrate a broadband optical feedback scheme by a curved high-reflection mirror for both the excitation and the Raman-scattering light, so that the excitation and the forward-propagating Raman signal can be back-reflected and collected with a high efficiency. Using the "F+2f" design, where F and f are the focal lengths of the focusing lens and curved reflection mirror, respectively, we were able to not only produce two focuses of the excitation laser beam but also extend the Raman interaction by a doubled distance. For the detection of pure ethanol molecules and the R6G molecules in water with a concentration of 10(-3) M, the Raman signal was enhanced by a factor of about 5.6. The optical feedback scheme and discovered optical mechanisms supply effective improvements to the Raman spectroscopic measurements on liquid samples.
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| GB/T 7714 | Liu, Miao , Mu, Yunyun , Hu, Jingyun et al. Optical Feedback for Sensitivity Enhancement in Direct Raman Detection of Liquids [J]. | JOURNAL OF SPECTROSCOPY , 2021 , 2021 . |
| MLA | Liu, Miao et al. "Optical Feedback for Sensitivity Enhancement in Direct Raman Detection of Liquids" . | JOURNAL OF SPECTROSCOPY 2021 (2021) . |
| APA | Liu, Miao , Mu, Yunyun , Hu, Jingyun , Li, Jiajun , Zhang, Xinping . Optical Feedback for Sensitivity Enhancement in Direct Raman Detection of Liquids . | JOURNAL OF SPECTROSCOPY , 2021 , 2021 . |
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摘要 ：
Miniaturization and integration of lasers have been a hot topic in recent years. Colloidal quantum dots (CQDS) can be used as laser gain media because of their high luminous efficiency and low threshold. Compact distributed Bragg reflector (DBR) combined with CQDs is used to construct micro laser. In this paper, CdTeSe/ZnS core-shell CQDs were prepared by aqueous synthesis. DBR was fabricated by magnetron sputtering using SiO2 and TiO2 through reasonable design of their thickness and repetition cycle number. CQDs were dropped on the surface of DBR to form a low-cost small-scale surface particle laser (SPL). The output emission of 770 nm and 824 nm dual wavelength laser is realized. The threshold is 11 mW/cm2 and the bandwidth is 1 nm. The micro integrated laser with high intensity and Narrow bandwidth near infrared emission has been completed.
关键词 ：
CdTeSe CdTeSe DBR DBR Dual-wavelength Dual-wavelength Micro laser Micro laser ZnS ZnS
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| GB/T 7714 | Wang, Jin , Su, Xue-Qiong , Gao, Dong-Wen et al. Near infrared dual wavelength micro surface particle laser [J]. | APPLIED SURFACE SCIENCE , 2021 , 562 . |
| MLA | Wang, Jin et al. "Near infrared dual wavelength micro surface particle laser" . | APPLIED SURFACE SCIENCE 562 (2021) . |
| APA | Wang, Jin , Su, Xue-Qiong , Gao, Dong-Wen , Chen, Rui-Xiang , Mu, Yun-Yun , Zhang, Xin-Ping et al. Near infrared dual wavelength micro surface particle laser . | APPLIED SURFACE SCIENCE , 2021 , 562 . |
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