Glassy Carbon Electrode Modified via Molybdenum Disulfide Decorated Multiwalled Carbon Nanotubes for Sensitive Voltammetric Detection of Aristolochic Acids

In this study, a molybdenum disulfide/multiwalled carbon nanotubes (MoS₂@MWCNTs) nanocomposite was synthesized by employing a simple hydrothermal method. The flower‐like structure of the MoS₂@MWCNTs was characterized via scanning electron microscopy (SEM) and transmission electron microscopy (TEM), and the load of crystalline MoS₂ was verified via X‐ray diffraction (XRD) and energy‐dispersive spectroscopy (EDS). The as‐prepared MoS₂@MWCNTs nanocomposite was used to modify glassy carbon electrode (GCE) as an electrochemical sensor for detecting aristolochic acids (AAs). With the optimized parameters, the proposed electrochemical sensor exhibited good sensitivity and a broad linear concentration range for detecting AAs from 0.2 to 10 μ mol/L and 10 to 100 μ mol/L, with the sensitivity of ?3.10 μ A/(μ mol/L) and ?0.91 μ A/(μ mol/L), respectively. The detection limit was also calculated as 0.06 μ mol/L (S/N=3) based on the low background signal. Furthermore, the modified electrochemical sensor exhibited good selectivity, repeatability, reproducibility, and stability, thus showing potential application for detecting AA in chinese herbs with good mean recovery and accuracy. In other words, the MoS₂@MWCNTs/GCE can be used as an excellent platform to detect AAs.     

基于碳纳米管的氧化铈纳米管的合成及表征

建立了一种制备氧化铈纳米管的新方法, 即以碳纳米管(CNTs)为模板, 在常温常压下采用液相沉积法在CNTs表面包覆CeO2, 通过煅烧除去CNTs模板, 得到氧化铈纳米管. 通过透射电子显微镜(TEM)、X射线衍射(XRD)和X射线光电子能谱(XPS)对其形貌和结构进行了表征. 所得CeO2纳米管为面心立方结构, 直径40~60 nm, 长度0.5~2 μm.     

Defect Engineering of Two-Dimensional Molybdenum Disulfide

Two-dimensional (2D) molybdenum disulfide (MoS₂) holds great promise in electronic and optoelectronic applications owing to its unique structure and intriguing properties. The intrinsic defects such as sulfur vacancies (SVs) of MoS₂ nanosheets are found to be detrimental to the device efficiency. To mitigate this problem, functionalization of 2D MoS₂ using thiols has emerged as one of the key strategies for engineering defects. Herein, we demonstrate an approach to controllably engineer the SVs of chemically exfoliated MoS₂ nanosheets using a series of substituted thiophenols in solution. The degree of functionalization can be tuned by varying the electron-withdrawing strength of substituents in thiophenols. We find that the intensity of 2LA(M) peak normalized to A_1g peak strongly correlates to the degree of functionalization. Our results provide a spectroscopic indicator to monitor and quantify the defect engineering process. This method of MoS₂ defect functionalization in solution also benefits the further exploration of defect-free MoS₂ for a wide range of applications.     

lixmos2的制备及其摩擦学特性

采用正丁基锂直接插入法制备出不同插层程度的LixMoS2,并考察了插层反应温度、反应物摩尔量比和反应时间等因素对插层效果的影响. 结果发现,控制反应物n-C4H9Li与MoS2的摩尔比为5～9、插层反应温度为30 ℃左右,在机械搅拌下反应36～48 h制得LixMoS2,在水中剥层后能制得不同插层程度的MoS2悬浮液. 采用XRD对该悬浮液中的MoS2颗粒进行了表征. 结果发现,在LixMoS2中的x值越大制得的MoS2衍射峰宽化越严重,晶粒越小,晶形越差. 在四球摩擦磨损试验机考察了不同插层程度的MoS2悬浮液的摩擦学性能. 结果表明,x值在0.618～1.39范围的摩擦系数和磨斑直径均随着x值的变化先减小后增加,在x为0.75左右时,抗磨减摩性能达到最佳.     

Attachment of Gold Nanoparticles to Carbon Nanotubes

Carbon nanotubes were initially chemically modified with an H2SO4-HNO3 treatment, and subsequently activated with Pd-Sn catalytic nuclei via a one-step activation approach. These activated nanotubes were used as precursors for obtaining gold nanoparticles-attached nanotubes via simple electroless plating. This approach provides an efficient method for attachment of metal nanostructures to carbon nanotubes. Such novel hybrid nanostructures are attractive for many applications.     

MoS2/C复合纳米管的合成

在900℃氢气气氛下,通过热分解载有硫代钼酸铵的碳纳米管前驱物得到MoS₂/C复合纳米管.通过粉末X射线衍射(XRD)、拉曼光谱(Raman)、高分辨透射电镜(HRTEM)和X射线能量散射仪(EDS)等方法对其形貌、结构和成分进行了表征.结果表明,所合成物质是一种由两种材料组成管壁的新型纳米管.     

碳纳米管的激光溅射产生

碳纳米管的激光溅射产生程大典,余荣清,刘朝阳,张强,王育煌,黄荣彬,詹梦熊,郑兰荪（固体表面物理化学国家重点实验室,厦门大学化学系,厦门,３６１００５）关键词碳纳米管,激光溅射,碳球Ｓｍａｌｌｅｙ等［１］曾以脉冲激光束在超声分子束喷口的喉道处蒸发石墨...     

碳纳米管在电分析中的应用

碳纳米管因其独特的特性,自发现以来得到了广泛的关注与应用;本文着重对碳纳米管在电分析中的应用作了综述。     

In-Groove Carbon Nanotubes Device for SPME of Aromatic Hydrocarbons

A new solid phase microextraction (SPME) fibre using carbon nanotubes as fibre coating incorporated into a groove of a stainless steel rod is suggested. It is mechanically stable and exhibits relatively high thermal stability (up to 280 °C). The coating showed especially good extraction efficiency for aromatic hydrocarbons. The extraction properties of the fibre to benzene, toluene, ethylbenzene and o-xylene were examined using both direct and headspace SPME modes coupled to gas chromatography-flame ionization detection. The parameters affecting the extraction efficiency (extraction temperature and time, salt addition, desorption temperature and time) were investigated and quality parameters were measured under the optimized conditions. For both headspace and direct SPME the calibration graphs were linear up to 100 mg L⁻¹ (R ² > 0.996) and detection limits ranged from 0.09 to 0.39 μg L⁻¹. The repeatabilities were 5.9–13.3%. The proposed coating was applied for aromatic hydrocarbons determination in petrol station waste waters.     

纳米碳管的制备

纳米碳管是一种新型的纳米材料和碳分子,其独特的分子结构和性能引起了人们的广泛关注。本文综述了纳米碳管的几种制备方法和相关的生长机理。     

Molybdenum Disulfide Based Nanomaterials for Rechargeable Batteries

The rapid development of electrochemical energy storage systems requires new electrode materials with high performance. As a two-dimensional material, molybdenum disulfide (MoS₂) has attracted increasing interest in energy storage applications due to its layered structure, tunable physical and chemical properties, and high capacity. In this review, the atomic structures and properties of different phases of MoS₂ are first introduced. Then, typical synthetic methods for MoS₂ and MoS₂-based composites are presented. Furthermore, the recent progress in the design of diverse MoS₂-based micro/nanostructures for rechargeable batteries, including lithium-ion, lithium-sulfur, sodium-ion, potassium-ion, and multivalent-ion batteries, is overviewed. Additionally, the roles of advanced in situ/operando techniques and theoretical calculations in elucidating fundamental insights into the structural and electrochemical processes taking place in these materials during battery operation are illustrated. Finally, a perspective is given on how the properties of MoS₂-based electrode materials are further improved and how they can find widespread application in the next-generation electrochemical energy-storage systems.     

碳纳米管贮氢研究进展

综述了碳纳米管在实验和理论方面的贮氢研究工作。不同科研工作者得到的实验结果很不一致，重量百分比分布在67％～0．01％之间。理论模拟结果差别相对小一些。碳纳米管中的氢吸附受有效表面积和孔体积的强烈影响，单壁碳纳米管堆积的几何形状在氢吸附中也起着重要作用。不少研究者认为碳纳米管并不是适合的贮氢材料。其贮氢量在1(wt)％以下。     

碳纳米管的定向操作

由于呈现独特的一维结构特征、机械及电子性能,碳纳米管已引起广泛的兴趣,然而涉及到具体的应用就不可避免碳纳米管的定位、定向,这也已成为非常富有挑战性的课题。本文中笔者主要介绍碳纳米管定向操作的最新进展,重点介绍后生长的平面有序定向操作。     

Continuous Production of Carbon Nanotubes by Using Moving Bed Reactor

Since the discovery in 19911, carbon nanotubes have been the subject of intensive research due to their extraordinary mechanical and electronic properties2-7. However, lack of sufficient amount of materials limited the study of the fundamental properties and development of more practical applications. It is highly desirable to have large quantities of pure nanotubes. To date, few methods have been developed for the production of high-quality tubes which can adapted to industrial production …     

碳纳米管在样品前处理中的应用

碳纳米管是一维碳基纳米材料,具有独特的管状结构、良好的化学稳定性、热稳定性和高比表面积.近年来,碳纳米管在有机小分子、金属离子和生物大分子分离富集方面得到了广泛的应用.本文综述了碳纳米管及功能化碳纳米管在固相萃取、固相微萃取、中空纤维膜保护固相微萃取和液膜萃取等样品前处理技术中的应用.     

A New Application of Carbon Nanotubes Constructing Biosensor

Carbon nanotubes used for constructing biosensor was described for the first time. Single-wall carbon nanotubes (SWNTs) functionalized with carboxylic acid groups were used to immobilize glucose oxidase forming a glucose biosensor. The biosensor response can be determined by amperometric method at a low applied potential (0.40V).     

碳纳米管的纯化

目前制备碳纳米管的方法很多，然而这些方法所制得的产物中除碳纳米管外常常还含有无定形碳、碳纳米粒子及催化剂颗粒等杂质，这些杂质的存在直接影响到碳纳米管的性能测试及其应用研究，因此碳纳米管的纯化研究十分必要与重要。而不同制备方法所得碳纳米管的性质以及所引入的杂质都不相同，这就增加了碳纳米管纯化研究的难度。本文结合该领域研究前沿对碳纳米管的纯化机理及方法做了系统的介绍。     

Direct Electrochemistry of Catalase on Single Wall Carbon Nanotubes Modified Glassy Carbon Electrode

Direct electrochemistry of catalase (Ct) has been studied on single wall carbon nanotubes (SWNTs) modified glassy carbon (GC) electrode. A pair of well-defined nearly reversible redox peaks is given at -0.48 V (vs. SCE) in 0.1 mol/L phosphate solution (pH 7.0).The peak current in cyclic voltammogram is proportional to the scan rate. The peak potential of catalase is shifted to more negative value when the pH increases. Catalase can adsorb on the SWNTs modified electrode.     

Microwave-Assisted Heating Method for the Decoration of Carbon Nanotubes with Zinc Sulfide Nanoparticles

This study focuses on in situ synthesis of ZnS nanoparticles on the surface of multiwalled carbon nanotubes. By microwave-assisted chemical reaction of Zn(Ac)₂·2H₂O and NaS·9H₂O in glycol solution with carbon nanotubes, which were pretreated by oxidization in concentrated HNO₃. Zinc sulfide crystallite densely supported on carbon nanotubes with the diameter about 1 nm. The carbon nanotubes decorated by ZnS were characterized using transmission electron microscopy and x-ray diffraction. It is found that the multi-walled carbon nanotubes can not only act as a substrate but also change the crystal structures of ZnS in the reaction.     

卟啉修饰的碳纳米管研究进展

从问题解决的视角介绍碳纳米管的性质和在应用方面存在的问题。重点介绍卟啉修饰的碳纳米管的优势以及卟啉修饰碳纳米管的方法、应用和近期的研究进展。