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In situ photoelectric biosensing based on ultranarrowband near-infrared plasmonic hot electron photodetection

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Advanced Photonics 2024年第2期6卷 81-89页

作者： Xianghong Nan Wenduo Lai Jie Peng Haiquan Wang Bojun Chen Huifan He Zekang Mo Zikun Xia Ning Tan Zhong Liu Long Wen Dan Gao Qin Chen Jinan University College of Physics & Optoelectronic Engineering Institute of Nanophotonics Guangdong Provincial Key Laboratory of Nanophotonic Manipulation Tsinghua University Shenzhen International Graduate School State Key Laboratory of Chemical Oncogenomics Jinan University College of Life Science and Technology

Narrowband photodetection is an important measurement technique for material analysis and sensing, for example, nondispersive infrared sensing technique. Both photoactive material engineering and nanophotonic filtering schemes have been explored to realize wavelength-selective photodetection,while most devices have a responsive bandwidth larger than 2% of the operating wavelength, limiting sensing performance. Near-infrared photodetection with a bandwidth of less than 0.2% of the operating wavelength was demonstrated experimentally in Au/Si Schottky nanojunctions. A minimum linewidth of photoelectric response down to 2.6 nm was obtained at a wavelength of 1550 nm by carefully tailing the absorptive and radiative loss in the nanostructures. Multiple functions were achieved on chip with the corrugated Au film, including narrowband resonance, light harvesting for sensing and photodetection, and electrodes for hot electron emission. Benefiting from such a unity integration with in situ photoelectric conversion of the optical sensing signal and the ultranarrowband resonance, self-contained on-chip biosensing via simple intensity interrogation was demonstrated with a limit of detection down to 0.0047%in concentration for glucose solution and 150 ng∕m L for rabbit IgG. Promising potential of this technique is expected for the applications in on-site sensing, spectroscopy, spectral imaging, etc.

关键词： Photodetectors Plasmonics Biosensing Optical gratings Gold Absorption spectrum Acoustooptic tunable filters Absorption Sensors In situ remote sensing

Structure and Performance of Fe-N_x-C Catalyst for Oxygen Reduction Reaction Prepared by Vacuum casting Method and the Second Pyrolysis

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Chinese Journal of Structural Chemistry 2018年第6期37卷 937-947页

作者：钱亚声童磊邵宗贵囤荣敏李文木 Key Laboratory of Optoelectronic Materials Chemistry and Physics Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences University of Chinese Academy of Sciences

Affordable non-precious metal（NPM） catalysts played a vital role in the wide application of polymer electrolyte membrane fuel cells（PEMFC）. In current work, a facile vacuum casting reacting method based on vacuum casting was introduced to prepare Fe-N_x-C oxygen reduction reaction（ORR） catalysts with high efficient in acid medium. The catalysts were prepared with ammonium ferrous sulfate hexahydrate（AFS） and 1,10-phenanthroline monohydrate utilizing homemade mesoporous silica template. The heat treatment and its influence on structure and performance were systematically evaluated to achieve superior ORR performance and some clues were found. And 850 ℃ was found to be the best temperature for the first and second pyrolysis. The linear sweep voltammetry（LSV） results showed that there were only 18 mV slightly negative shifts of half-wave potential（E_（1/2）） of the optimal catalyst（749 mV） compared with the commercial Pt/C（20 μg·Pt·cm^-2）. Besides, I850 R also showed better electrochemical stability and methanol-tolerance than that of Pt/C. All evidences proved that our vacuum casting reacting strategy and heat treatment process were prospective for the future R＆D of high performance Fe-N_x-C ORR catalysts.

关键词： oxygen reduction reaction acid medium vacuum casting reacting method temperature affected structure second pyrolysis

Oligo(aromatic ether sulfone)-F as a Nonlinear Polarized Polymeric Material: an Experiment and DFT Study

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Chinese Journal of Structural Chemistry 2021年第3期40卷 383-393,275页

作者： GAN Dong-Er ZHANG Zhang LI Qiao-Hong LI Wen-Mu Key Laboratory of Optoelectronic Materials Chemistry and Physics Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China University of Chinese Academy of Sciences Beijing 100049China

Polymeric membranes with diverse structures have attracted much attention as new materials for nonlinear optical devices. In this report, a novel oligomer of poly(aromatic ether sulfone)(OAES) has been synthesized and characterized. The electronic structure as well as linear and nonlinear optical properties has been studied by density function theory. The effect for general nonlinear optical polarizability of various condition has been further researched such as absence of side chains and introduction of phenyl substituent on side chains. The static and frequency-dependent hyperpolarizabilities of OAES and its derivatives have been calculated. This work interprets an efficient adjustment for the frequency response and the intensity of nonlinear optical polarizability can be achieved by regulating the structure of system, which provides a new potential for the application of oligomeric materials on nonlinear optical field.

关键词： DFT method NLO properties oligo(aromatic ether sulfone)-F sum-over-states method

Ethanol catalytic deposition of MoS2 on tapered fiber

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Photonics Research 2015年第3期3卷 102-107页

作者： Hao Wang Bohua Chen Xiaoyan Zhang Sheng Liu Bangqi Zhu Jun Wang Kan Wu Jianping Chen State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronic EngineeringShanghai Jiao Tong UniversityShanghai 200240China Key Laboratory of Materials for High-Power Laser Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China

Deposition of two-dimensional（2D） MoS2 materials on the tapered fiber allows various photonic applications including saturable absorbers and four-wave *** catalytic deposition（ECD） of MoS2 on the optical tapered fiber was proposed and demonstrated in this *** from the conventional optical driven deposition using water or organic solvent,the ECD method utilized the high volatility of the ethanol solvent,which significantly increased the movement speed of the MoS2 nanosheets and thus boosted the deposition rate and reduced the minimum power threshold to drive the *** believe the ECD method should be able to be applied to other similar 2D materials such as other types of transition metal chalcogenides.

关键词： Mo than rate Ethanol catalytic deposition of MoS2 on tapered fiber EDFA

Passively Q-switched mode-locked Tm:LLF laser with a MoS_2 saturable absorber

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Chinese Optics Letters 2015年第8期13卷 70-73页

作者：邹晓冷雨欣李妍妍冯艳艳张沛雄杭寅王俊 State Key Laboratory of High Field Laser Physics Shanghai Institute of Optics and Fine MechanicsChinese Academy of Sciences Key Laboratory of Materials for High Power Lasers Shanghai Institute of Optics and Fine MechanicsChinese Academy of Sciences

A passively Q-swithched mode-locked （QML） Tm：LiLuF4 （LLF） laser with a MoS2 saturable absorber （SA） is demonstrated for the first time, to our best knowledge. For the Q-switching mode, the maximum average output power and Q-switched pulse energy are 583 mW and 41.5 μJ, respectively. When the absorbed power is greater than 7.4 W, the passively QML pulse is formed, corresponding to an 83.3-MHz frequency. The modulation depth in Q-switching envelopes is approximately 50%. Results prove that MoS2 is a promising SA for Q-switched and QML solid-state lasers.

关键词： mode Mo Passively Q-switched mode-locked Tm Tm

Characteristics and distributions of humic acids in two soil profiles of the southwest China Karst area

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Acta Geochimica 2016年第1期35卷 85-94页

作者： Liangang Ma Baohua Xiao Xinyue Di Weilin Huang Shijie Wang State Key Laboratory of Environmental Geochemistry Institute of Geochemistry Chinese Academy of SciencesGuiyang 550002 China University of Chinese Academy of Sciences Beijing 100049China Department of Environmental Sciences Rutgers UniversityNew Brunswick NJ 08901 USA

Characteristics and distributions of humic acid(HA) and soil organic matter(SOM) in a yellow soil profile and a limestone soil profile of the southwest China Karst area were systematically investigated to reveal their evolutions in different soils of the study area. The results showed that characteristics and distribution of SOM along the two soil profiles were notably different. Total organic carbon(TOC) contents of soil samples decreased just slightly along the limestone soil profile but sharply along the yellow soil profile. TOCs of the limestone soils were significantly higher than those of the corresponding yellow soils, and C/N ratios of SOMs showed a similar variation trend to that of TOCs, indicating that SOM can be better conserved in the limestone soil than in the yellow soil. The soil humic acids were exhaustively extracted and further fractionated according to their apparent molecular weights using ultrafiltration techniques to explore underlying conservation mechanisms. The result showed that C/N ratios of HAs from different limestone soil layers were relatively stable and that large molecular HA fractions predominated the bulk HA of the top soil, indicating that HA in the limestone profile was protected while bio and chemical degradations were retarded. Combined with organic elements contents and mineral contents of two soils, weconcluded that high calcium contents in limestone soils may play a key role in SOM conservation by forming complexation compounds with HAs or/and enclosing SOMs with hypergene CaCO_3 precipitation.

关键词： Soil Soil organic matter Humic acid Characteristics Distribution Southwest China Karst area

A panel of monoclonal antibodies against the prion protein proves that there is no prion protein in human pancreatic ductal epithelial cells

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Virologica Sinica 2014年第4期29卷 228-236页

作者： Liheng Yang Yan Zhang Lipeng Hu Ying Zhu Man-Sun Sy Chaoyang Li State Key Laboratory of Virology and Department of Molecular Virology Wuhan Institute of Virology Chinese Academy of Sciences Department of Virology School of Life Sciences Wuhan University Department of Molecular Endocrinology Institute of Hydrobiology Chinese Academy of Sciences Department of Pathology Case Western Reserve University

Prion diseases are a group of neurodegenerative diseases that are fatal. The study of these unique diseases in China is hampered by a lack of resources. Amongst the most important resources for biological study are monoclonal antibodies. Here, we characterize a panel of monoclonal antibodies specific for cellular prion protein by enzyme-linked immunosorbent assay(ELISA), immunofluorescent staining, flow cytometry, and western blotting. We identify several antibodies that can be used for specific applications and we demonstrate that there is no prion protein expression in human pancreatic ductal epithelial cells(HPDC).

关键词： prion protein monoclonal antibody human pancreatic ductal epithelial cells

Phase Behaviors of Soft-core Particle Systems

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Chinese Journal of Polymer Science 2019年第11期37卷 1065-1082页

作者： Ning Xu Hefei National Laboratory for Physical Sciences at the Microscale CAS Key Laboratory of Soft Matter Chemistry and Department of Physics University of Science and Technology of China

This paper reviews some of our recent works on phase behaviors of particulate systems with a soft-core interaction potential. The potential is purely repulsive and bounded, i.e., it is finite even when two particles completely overlap. The one-sided linear spring (harmonic) potential is one of the representatives. This model system has been successively employed to study the jamming transition, i.e., the formation of rigid and disordered packings of hard particles, and establish the jamming physics. This is actually based on the "hard" aspect of the potential, because at low densities and when particle overlap is tiny the potential resembles the hard sphere limit. At high densities, the potential exhibits its "soft" aspect: with the increase of density, there are successive reentrant crystallizations with many types of solid phases. Taking advantage of the dual nature of the potential, we investigate the criticality of the jamming transition from different perspectives, extend the jamming scenario to high densities, reveal the novel density evolution of two-dimensional melting, and find unexpected formation of quasicrystals. It is surprising that such a simple potential can exhibit so rich and unexpected phenomena in phase transitions. The phase behaviors discussed in this paper are also highly regarded in polymer science, which may thus shed light on our understanding of polymeric systems or inspire new ideas in studies of polymers.

关键词： Phase transitions Soft-core particles Jamming Two-dimensional melting Quasicrystals

INVESTIGATION ON THE VALENCE STATE OF Ce ATOMIN BULK AND NANOCRYSTAL CeO_2 BY X-RAY ABSORPTION ANDPHOTOEMISSION

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Acta Metallurgica Sinica(English Letters) 2001年第6期14卷 511-516页

作者： K. Ibrahim, Z.Y. Wu, J. Zhang, M.I. Abbas, F.Q. Liu and H.J. Qian (Beijing Synchrotron Radiation Laboratory, Institute of High Energy Physics, The Chinese Academy of Sciences, P.O. Box 918, Beijing 100039, China) Beijing Synchrotron Radiat. Lab. Inst. of High Energy Phys. Chinese Acad. of Sci. P.O. Box 918 Beijing 100039 China

Valence band photoemission spectra (PES) for both bulk and nanocrystal CeO2 have been measured on and off resonance of Ce 4d-4f absorption edge. The PES show that the bulk and nanocrystal CeO2 of diameter ranging from 8nm to 50nm exhibit a peak near Fermi edge with binding energy of about 1.8eV. The 1.8eV peak shows a strong dependence on excitation energy, although it looks like the contribution of Ce3+ ion following the data reported in literatures. However, according to the results of resonance photoemission and X-ray absorption spectra at 1s edge, this electronic structure may be associated to the intermediate state charge transfer effects.

关键词： rare earth oxide photoemission electronic structure photoabsorption