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Special issue on the 100^(th) anniversary of Xiamen University

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Light(Science & Applications) 2021年第10期10卷 1812-1813页

作者： Junyong Kang Minghui Hong zhongqun tian Engineering Research Center of Micro-nano Optoelectronic Materials and Devices Ministry of EducationFujian Key Laboratory of Semiconductor Materials and ApplicationsCI center for OSEDCollege of Physical Science and Technology361005 XiamenChina Department of Electrical and Computer Engineering National University of Singapore4 Engineering Drive 3117576 SingaporeSingapore State Key Laboratory of Physical Chemistry of Solid Surfaces Collaborative Innovation Center of Chemistry for Energy MaterialsCollege of Chemistry and Chemical EngineeringXiamen University361005 XiamenChina

This special issue is devoted to the celebration of the century anniversary of Xiamen University(XMU)(6 April 2021)and the establishment of the LSA Editorial Office in Xiamen(3 July 2021),a collection to highlight the recent exciting research works performed in XMU or by XMU alumni,from all aspects of optics and photonics,including basic,applied and engineering research and *** guest editors are three XMU alumni who are active researchers in these areas:Professor Minghui Hong from National University of Singapore,Professor zhongqun tian and Professor Junyong Kang from XMU.

关键词： Xiamen anniversary devoted

Surface bonding on silicon surfaces as probed by tip-enhanced Raman spectroscopy

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Science China Chemistry 2010年第2期53卷 426-431页

作者： ZHUANG MuDe LIU Zheng REN Bin tian zhongqun State Key Laboratory of Physical Chemistry of Solid Surfaces and Department of Chemistry College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China

Tip-enhanced Raman spectroscopy (TERS) has been used to obtain the Raman signal of surface species on silicon single crystal surfaces without the necessity for surface enhancement by addition of Ag nanoparticles. By illuminating the hydrogen terminated silicon surface covered with a droplet of 4-vinylpyridine with UV light, a 4-ethylpyridine modified silicon surface can be easily obtained. By bringing a scanning tunneling microscope (STM) Au tip with a nanoscale tip apex to a distance of ca. 1 nm from the modified silicon surface, enhanced Raman signals of the silicon phonon vibrations and the surface-bonded 4-ethylpyridine were obtained. The Raman enhancement factor was estimated to be close to 107. By comparing the surface enhanced Raman scattering (SERS) signal obtained after surface enhancement with Ag nanoparticles and the TERS signal of the surface, the advantage of TERS over SERS for characterizing the surface species on substrates becomes apparent: TERS readily affords vibrational information about the system without disturbing it by surface enhancement. In this sense, TERS can be considered a truly non-invasive tool which is ideal for characterizing the actual surface species on substrates.

关键词： tip-enhanced Raman spectroscopy silicon single crystal 4-ethylpyridine surface modification

Selective electrocatalytic conversion of methane to fuels and chemicals

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Journal of Energy Chemistry 2018年第6期27卷 1629-1636页

作者： Shunji Xie Shengqi Lin Qinghong Zhang zhongqun tian Ye Wang State Key Laboratory of Physical Chemisary of Solid Surfaces Collaborative Innovation Center of Chemistry for Energy Materials National EngineeringLaboratory for Green Chemical Productions of Alcohols Ethers and Esters College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 Fujian China

The increase in natural gas reserves makes methane a significant hydrocarbon feedstock. However, thedirect catalytic conversion of methane into liquid fuels and useful chemicals remains a great challenge,and many studies have been devoted to this field in the past decades. Electrocatalysis is considered asan important alternative approach for the direct conversion of methane into value-added chemicals, al-though many other innovative methods have been developed. This review highlights recent advances inelectrocatalytic conversion of methane to ethylene and methanol, two important chemicals. The electro-catalytic systems efficient for methane conversions are summarized with an emphasis on catalysts andelectrolytes. The effects of reaction conditions such as the temperature and the acid-base property of thereaction medium are also discussed,

关键词： Methane Electrocatalysis Selective conversion Value-added chemicals

Kinetic Investigation of a Cucurbit[7]uril-Based Pseudo[6]rotaxane System by Microfluidic Nuclear Magnetic Resonance

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CCS Chemistry 2022年第2期4卷 557-565页

作者： Yibin Sun Hongxun Fang Xujing Lin Xiuxiu Wang Ganyu Chen Xinchang Wang zhongqun tian Liulin Yang Marcel Utz Xiaoyu Cao State Key Laboratory of Physical Chemistry of Solid Surfaces College of Chemistry and Chemical EngineeringCollaborative Innovation Center of Chemistry for Energy Materials(iChEM)Key Laboratory of Chemical Biology of Fujian ProvinceXiamen UniversityXiamen 361005 School of Electronic Science and Engineering(National Model Microelectronics College) Xiamen UniversityXiamen 361005 School of Chemistry University of SouthamptonSouthampton SO171BJ

It is challenging to investigate fast supramolecular processes due to the lack of appropriate characterization methods with high structural *** this study,microfluidic nuclear magnetic resonance(μFNMR)spectroscopy was employed to monitor the kinetics of threading and dethreading of a pseudo[6]rotaxane *** employing high time resolutionμF-NMR,1 H and two-dimensional(2D)rotating frame nuclear Overhauser effect spectroscopy(ROESY)NMR spectra were recorded at any time point within 1.5 s after the onset of the *** technique enabled the successful identification of kinetic intermediates and rate-determining steps,usually impossible to determine by other spectroscopic ***,our study demonstrates the capability ofμF-NMR in investigating the mechanism of complex supramolecular systems.

关键词： host-guest chemistry kinetics cucurbituril β-cyclodextrin microfluidic NMR

Unexpected current-voltage characteristics of mechanically modulated atomic contacts with the presence of molecular junctions in an electrochemically assisted-MCBJ

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Nano Research 2016年第2期9卷 560-570页

作者： Yang Yang Junyang Liu Shi Feng Huimin Wen Jinghua tian Jueting Zheng Bernd Schollhorn Christian Amatore Zhongning Chen zhongqun tian Department of Chemistry/Pen-Tung Sah Institute of Micro-Nano Science and Technology State Key Laboratory of Physical Chemistry of Solid Surfaces and LIA CNRS NanoBioCatEchem Collaborative Innovation Center of Chemistry for Energy Materials Xiamen University Xiamen 361005 China State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter Chinese Academy of SciencesFuzhou 350002 China CNRS UMR 8640 PASTEUR and LIA CNRS NanoBioCatEchem Ecole Normale Superieure-PSL Research University Departement de Chimie Sorbonne Universit~s - UPMC Paris 6 24 rue Lhomond 75005 Paris France

In this article, we report on the characterization of various molecular junctions＇ current-voltage characteristics （Ⅰ-Ⅴ curves） evolution under mechanical modulations, by employing a novel electrochemically assisted-mechanically controllable break junction （EC-MCBJ） method. For 1,4-benzenedithiol, the Ⅰ-Ⅴ curves measured at constant electrode pair separation show excellent reproducibility, indicating the feasibility of our EC-MCBJ method for fabricating molecular junctions. For ferrocene-bisvinylphenylmethyl dithiol （Fc-VPM）, an anomalous type of Ⅰ-Ⅴ curve was observed by the particular control over the stepping motor. This phenomenon is rationalized assuming a model of atomic contact evolution with the presence of molecular junctions. To test this hypothesized model, a molecule with a longer length, 1,3-butadiyne-linked dinuclear ruthenium（H） complex （Ru-1）, was implemented, and the Ⅰ-Ⅴ curve evolution was investigated under similar circumstances. Compared with Fc-VPM, the observed Ⅰ-Ⅴ curves show close analogy and minor differences, and both of them fit the hypothesized model well.

关键词： molecular junction electrochemical deposition mechanically controllable break junction (MCBJ) ruthenium complex ferrocenyl molecular wire

An Electrochemically Assisted Mechanically Controllable Break Junction Approach for Single Molecule Junction Conductance Measurements

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Nano Research 2011年第12期4卷 1199-1207页

作者： Yang Yang Zhaobin Chen Junyang Liu Miao Lu Dezhi Yang Fangzu Yang zhongqun tian State Key Laboratory of Physical Chemistry of Solid Surfaces and Department of Chemistry College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 China Micro-Electro-Mechanical Systems Research Center Pen-Tung Sah Micro-Nano Technology Institute Xiamen University Xiamen 361005 China

我们向调查单个分子传导力汇报一条电气化学地帮助的机械地可控制的裂缝连接(EC-MCBJ ) 途径。与金 nanobridge 连接的电极对被电气化学的免职制作然后在一个 homebuilt MCBJ 平台上增长了。很多 Au- molecule-Au 连接被金 nanobridge ... 详细信息

我们向调查单个分子传导力汇报一条电气化学地帮助的机械地可控制的裂缝连接(EC-MCBJ ) 途径。与金 nanobridge 连接的电极对被电气化学的免职制作然后在一个 homebuilt MCBJ 平台上增长了。很多 Au- molecule-Au 连接被金 nanobridge 碎重复并且重新连接顺序生产。以便测量他们的单个分子传导力，统计传导力直方图为 benzene-1,4-dithiol (BDT ) 和 4,4-bipyridine (BPY ) 被产生。从这些直方图提取的价值被发现在象以前在文学报导的价值的一样的范围。我们的方法从过去常然而，获得这些以前报导的文学价值的是不同的因为它更快，更简单，更划算，并且改变电极材料是更方便的。

关键词：电化学沉积测量方法辅助机械分子结电导可控断裂成本效益

Ultrahigh-performance mesoporous ZnMn2O4 microspheres as anode materials for lithium-ion batteries and their in situ Raman investigation

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Nano Research 2018年第7期11卷 3814-3823页

作者： Xiaobin Zhong1 Xiaoxiao wang Huiyuan Wang Zhizheng Yang Yuxiong Jiang Jianfeng Li zhongqun tian MOE Key Laboratory of Spectrochemical Analysis and Instrumentation State Key Laboratory of Physical Chemistry of Solid Surfaces College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 China Key Laboratory of Automobile Materials Ministry of Education College of Materials Science and Engineering Jilin University Changchun 130012 China

Currently, lithium-ion batteries play a key role in energy storage; however, their applications are limited by their low energy density. Here, we design a facile method to prepare mesoporous ZnMn2O4 microspheres with ultrahigh rate performance and ultralong cycling properties by finely tuning the solution viscosity during synthesis. When the current density is raised to 2 A·g^-1, the discharge capacity is maintained at 879 mA·h·g^-1 after 500 cycles. The electro- chemical properties of mesoporous ZnMn2O4 microspheres are better than that for most reported ZnMn2O4. To understand the electrochemical processes on the mesoporous ZnMn2O4 microspheres, in situ Raman spectroscopy is used to investigate the electrode surface. The results show that mesoporous ZnMn2O4 microspheres have a great potential as an alternative to commercial carbon anode materials.

关键词： ZnMn2O4 mesoporous microspheres viscosity in situ Raman ultralong cycling stability

Promising electroplating solution for facile fabrication of Cu quantum point contacts

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Nano Research 2017年第10期10卷 3314-3323页

作者： Yang Yang Junyang Liu Jueting Zheng Miao Lu Jia Shi Wenjing Hong Fangzu Yang zhongqun tian State Key Laboratory of Physical Chemistry of Solid Surfaces College of Chemistry and Chemical Engineering Pen-Tung Sah Institute ot Micro-Nano Science and Technology LIA CNRS NanoBioCatEchem Collaborative Innovation Center of Chemistry for Energy Materials Xiamen University Kiamen 361005 China

In this article, we report on the fabrication and transport measurements of Cu quantum point contacts prepared by a novel, electrochemically assisted mechanically controllable break junction （EC-MCBJ） method. By employing photolithography and wet-etching processes, suspended electrode pairs were patterned and fabricated successfully on Si microchips. Rather than adopting an acid Cu electroplating solution, a novel alkaline electroplating solution was developed and utilized to establish Cu nanocontacts between electrode pairs. Typically, the widths of the as-fabricated Cu nanocontacts were found to be smaller than 18 nm. A large number of Cu quantum point contacts were then produced and characterized by a home-built MCBJ setup. In addition to the conventional histogram, where peaks tend to decrease in amplitude with increasing conductance, an anomalous type of conductance histogram, exhibiting different peak amplitudes, was observed. Through statistical analysis of the maximum allowable bending of the Si microchips, and theoretical calculations, we demonstrated that our alkaline Cu electroplating solution affords Cu nanocontacts that are compatible with subsequent MCBJ operations, which is essential for the fabrication of Cu quantum point contacts. As sophisticated e-beam lithography is not required, the EC-MCBJ method is fast, simple, and cost-effective. Moreover, it is likely to be suitable for the fabrication and characterization of quantum point contacts of various metals from their respective electroplating solutions.

关键词： quantum point contact electrochemical deposition Cu nanowire mechanically controllablebreak junction (MCBJ) conductance quantization

The coupling effect of slow-rate mechanical motion on the confined etching process in electrochemical mechanical micromachining

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Science China Chemistry 2018年第6期61卷 715-724页

作者： Lianhuan Han Yuchao Jia Yongzhi Cao Zhenjiang Hu Xuesen Zhao Shusen Guo Yongda Yan zhongqun tian Dongping Zhan Key Laboratory of Micro-Systems and Micro-Structures Manufacturing of Ministry of Education Harbin Institute of Technology Center for Precision Engineering Harbin Institute of Technology State Key Laboratory of Physical Chemistry of Solid Surfaces (PCOSS) Collaborative Innovation Centre of Chemistry for Energy Materials(iChEM) and Department of Chemistry College of Chemistry and Chemical Engineering Xiamen University

By introducing the mechanical motion into the confined etchant layer technique(CELT), we have developed a promising ultraprecision machining method, termed as electrochemical mechanical micromachining(ECMM), for producing both regular and irregular three dimensional(3 D) microstructures. It was found that there was a dramatic coupling effect between the confined etching process and the slow-rate mechanical motion because of the concentration distribution of electrogenerated etchant caused by the latter. In this article, the coupling effect was investigated systemically by comparing the etchant diffusion, etching depths and profiles in the non-confined and confined machining modes. A two-dimensional(2 D) numerical simulation model was proposed to analyze the diffusion variations during the ECMM process, which is well verified by the machining experiments. The results showed that, in the confined machining mode, both the machining resolution and the perpendicularity tolerance of side faces were improved effectively. Furthermore, the theoretical modeling and numerical simulations were proved valuable to optimize the technical parameters of the ECMM process.

关键词：机械运动电气化学蚀刻剂机器制造技术参数制造方法微观结构模拟模型