CNx薄膜的结构、力学性能和摩擦学性能

采用射频磁控溅射方法制备了非晶CNx薄膜。利用纳米硬度计研究了薄膜沉积过程中基体负偏压对薄膜硬度和弹性的影响。利用X光电子能谱分析了CNx薄膜的结构。另外 ,还研究了在微动摩擦实验中振动频率、振幅和载荷对摩擦系数的影响。     

类石墨相氮化碳二维纳米片的制备及可见光催化性能研究

以三聚氰胺为原料制备类石墨相氮化碳(g-C3N4),采用球磨与超声联用技术制备g-C3N4二维纳米片. 利用X 射线衍射光谱(XRD)、紫外-可见漫反射(UV-Vis)光谱、扫描电镜(SEM)、透射电镜(TEM)、原子力显微镜(AFM)、荧光(PL)光谱等分析手段对制备的催化剂进行了表征. 结果表明: g-C3N4二维纳米片具有与体相g-C3N4相同的晶体结构,片层结构仅有5个原子层厚.g-C3N4二维纳米片增加了对可见光的吸收,提高了光生电子-空穴对的分离效率.以染料罗丹明B的降解反应研究了g-C3N4二维纳米片在可见光下的催化性能. 结果表明,球磨超声1 h后制备的g-C3N4二维纳米片表现出最佳的光催化性能, 150 min 内对罗丹明B的降解率高达94%,是体相g-C3N4的2 倍.     

类石墨相氮化碳二维纳米片的制备及可见光催化性能研究

以三聚氰胺为原料制备类石墨相氮化碳(g-C_3N_4),采用球磨与超声联用技术制备g-C_3N_4二维纳米片。利用X射线衍射光谱(XRD)、紫外-可见漫反射(UV-Vis)光谱、扫描电镜(SEM)、透射电镜(TEM)、原子力显微镜(AFM)、荧光(PL)光谱等分析手段对制备的催化剂进行了表征。结果表明:g-C_3N_4二维纳米片具有与体相g-C_3N_4相同的晶体结构,片层结构仅有5个原子层厚。g-C_3N_4二维纳米片增加了对可见光的吸收,提高了光生电子-空穴对的分离效率。以染料罗丹明B的降解反应研究了g-C_3N_4二维纳米片在可见光下的催化性能。结果表明,球磨超声1h后制备的g-C_3N_4二维纳米片表现出最佳的光催化性能,150min内对罗丹明B的降解率高达94%,是体相g-C_3N_4的2倍。     

氮化碳的制备、结构和性能

本文简要评述了人工合成新材料氮化碳（Ｃ３Ｎ４）的制备方法，以及制备方法对成分、结构和性能的影响。并作出了氮化碳研究的发展展望。     

New 2D Carbon Nitride Organic Materials Synthesis with Huge‐Application Prospects in CN Photocatalyst

In recent years, 2D materials are attracting increased attention because of their excellent properties. In this paper, new 2D carbon nitride (CN) organic materials are successfully prepared on the basis of the organic synthesis theory, and the thickness is about 1.5 nm. This new 2D CN organic material further strengthens the 2D materials family. Meanwhile, their synthetic mechanism is theoretically speculated. Then CN photocatalysts of several structures are obtained by roasting 2D CN organic materials. Through the photocatalytic hydrogen production experiments, the results exhibit that these kinds of photocatalysts have good photocatalytic effects compared to common g‐C₃N₄.     

a-C:N膜的制备及结构分析

采用射频溅射法在锗衬底上沉积无定形碳氮膜 (a- C:N) ,用 X射线光电子谱 (XPS)、傅立叶变换红外光谱 (FT- IR)和喇曼光谱 (RS)分析了膜的成分与结构。结果表明 ,氮是以化学键的形式存在于膜中 ,且有三种不同的 C- N键合状态。随着反应气体中氮气分压的增加 ,a- C:N膜中氮浓度增加 ,C≡N键的含量增加。     

新型二维硅碳氮纳米片的制备及其电化学性能

本文采用高温煅烧方法,制备了新型硅碳氮(SiCN)纳米材料,利用场发射扫描电镜(FESEM)、X射线光电子能谱(XPS)等手段对该材料进行了一系列的结构和物相表征,发现该材料是具有微孔结构的层状材料,且其比表面积达到了420m2/g。通过循环伏安(CV),恒流电流充放电(GCD)和交流阻抗(EIS)等检测手段研究了该材料的超级电容器性能,结果表明:该电极材料在酸性电解液中,表现出优异的比容量和循环稳定性能。本文设计并提出的这种新颖简单的SiCN材料的制备方法也可应用于其他能量存储材料的开发与研究。     

氮化钽薄膜的制备与结构研究

利用磁控反应溅射技术制备了氮化钽薄膜，利用ＴＥＭ、ＸＲＤ技术研究了薄膜的微观结构。研究结果表明：薄膜中多相共存；薄膜晶粒细小（１６ｎｍ左右）；同时还发现，在一定工作压力下，随着氮分压的提高，氮化物晶粒形成的取向改变，即平行于基体表面生长的晶面会有改变。一定工作压力下，制备的氮化钽薄膜硬变高达４０００ｋｇ／ｎｍ＾２以上。本文探讨了氮化钽薄膜高硬度的原因，并且讨论了随氮分压的提高薄膜织构变化的原因。     

磁控溅射法制备CNx薄膜及其结构表征

以Ar/N2混合气体作为溅射气体,利用直流磁控溅射的方法制备子碳氮薄膜.利用X射线衍射和红外光谱对碳氮薄膜进行了结构分析.IR光谱证实了薄膜中碳氮化合物的形成,而XRD的检测结果表明,类石墨相g-C3N4是碳氮薄膜中的主要成分,同时有极少量的β-C3N4晶相生成.同时发现,Ar/N2溅射气体的分压对获取β-CsN4有着明显的影响.本实验中,当N2体积分数为33%,碳氮薄膜中β-C3N4晶相的含量最高.     

Thermally stable luminescence and energy transfer in Ce, Mn doped Sr2Mg(BO3)2 phosphor

Sr₂Mg(BO₃)₂:Ce³⁺,Li⁺ and Sr₂Mg(BO₃)₂:Ce³⁺,Li⁺,Mn²⁺ phosphors have been synthesized by conventional solid state reaction technology at 900 °C for 12 h in reducing atmosphere. The phase purity, photoluminescence (PL) properties, thermal stability, energy transfer and luminescent decay curves have been investigated. Sr₂Mg(BO₃)₂:Ce³⁺,Li⁺,Mn²⁺ phosphors show blue and deep-red¹ emission bands. The deep-red emission band is attributed to the energy transfer from Ce³⁺ to Mn²⁺. The fluorescence lifetimes of Ce³⁺ in co-doped sample are shorter than that in single doped one, which confirms that the energy transfer takes place. The phosphors have weak thermal quenching. The luminescence properties of Sr₂Mg(BO₃)₂:Ce³⁺,Li⁺,Mn²⁺ make the phosphor a new bicolor emitting material.     

Yb3+/Er3+共掺杂BaY2F8纳米颗粒的水热合成与上转换发光

采用水热方法合成了Yb3+/Er3+共掺杂BaY2F8纳米颗粒,并对其进行了不同温度的热处理,热处理温度为200℃-800℃。研究了热处理温度对纳米粒子的晶相、粒径和上转换发光强度的影响。结果发现随着热处理温度的升高,纳米粒子的粒径和上转换发光强度明显增加。讨论了BaY2F8:Yb3+,Er3+纳米粒子的上转换发光机理。     

Unprecedented Centimeter‐Long Carbon Nitride Needles: Synthesis,Characterization and Applications

Free standing centimeter‐long 1D nanostructures are highly attractive for electronic and optoelectronic devices due to their unique photophysical and electrical properties. Here a simple, large‐scale synthesis of centimeter‐long 1D carbon nitride (CN) needles with tunable photophysical, electric, and catalytic properties is reported. Successful growth of ultralong needles is acquired by the utilization of 1D organic crystal precursors comprised of CN monomers as reactants. Upon calcination at high temperatures, the shape of the starting crystal is fully preserved while the CN composition and porosity, and optical and electrical properties can be easily tuned by tailoring the starting elements ratio and final calcination temperature. The facile manipulation and visualization of the CN needles endow their direct electrical measurements by placing them between two conductive probes. Moreover, the CN needles exhibit good photocatalytic activity for hydrogen production owing to their improved light harvesting properties, high surface area, and advantageous energy bands position. The new growth strategy developed here may open opportunities for a rational design of CN and other metal‐free materials with controllable directionality and tunable photophysical and electronic properties, toward their utilization in (photo)electronic devices.     

掺杂不同比例Sr的La1-xSrxMnO3微结构研究

La1-xSrMnO3材料具有热致相变特性,成为具有潜在应用前景的空间小卫星热控功能材料.La1-xSrxMnO3是一种结构非常敏感性材料,掺杂比例对其结构和性能影响很大.本项研究中采用传统的固相反应方法,通过控制烧结温度、退火时间、成分配比等关键工艺参数,制备出不同掺杂比例的La1-xSrxMO3陶瓷片.利用X射线衍射分析了薄膜的成分、相结构、结晶情况.实验研究表明,La1-xSrxMnO3材料是结构敏感化合物,随着不同比例Sr掺杂,La1-xSrxMnO3材料的微结构将发生很大的变化.     

氮化碳薄膜制备及性能研究进展

本文对氮化碳的结构及制备工艺如溅射、化学气相沉积、离子束辅助沉积、激光烧蚀等作了较为详细的总结与分析,对各种制备工艺条件下的氮化碳的性能包括力学、电学及光学性能进行了讨论,并对今后的发展趋势提出了自己的见解．     

Synthesis and electrochemical performance of a laminated hollow porous carbon

A laminated hollow porous carbon with high surface area of 2368 m²/g was synthesized using a nonporous metal organic coordinate polymer as template. When used as electrode materials for electric double layer capacitors, the synthesized porous carbon presents a high specific capacitance of 234 F/g at a current density of 10 mA/g in 6 M KOH electrolyte and the capacitance retention can obtain 87% at current density of 20,000 mA/g.     

Confined Synthesis of Carbon Nitride in a Layered Host Matrix with Unprecedented Solid‐State Quantum Yield and Stability

Fluorescent carbon nanomaterials have drawn tremendous attention for their intriguing optical performances, but their employment in solid‐state luminescent devices is rather limited as a result of aggregation‐induced photoluminescence quenching. Herein, ultrathin carbon nitride (CN) is synthesized within the 2D confined region of layered double hydroxide (LDH) via triggering the interlayer condensation reaction of citric acid and urea. The resulting CN/LDH phosphor emits strong cyan light under UV‐light irradiation with an absolute solid‐state quantum yield (SSQY) of 95.9 ± 2.2%, which is, to the best of our knowledge, the highest value of carbon‐based fluorescent materials ever reported. Furthermore, it exhibits a strong luminescence stability toward temperature, environmental pH, and photocorrosion. Both experimental studies and theoretical calculations reveal that the host–guest interactions between the rigid LDH matrix and interlayer carbon nitride give the predominant contribution to the unprecedented SSQY and stability. In addition, prospective applications of the CN/LDH material are demonstrated in both white light‐emitting diodes and upconversion fluorescence imaging of cancer cells.     

Structural and vibrational properties of microcrystalline TlM(MoO4)2 (M = Nd, Pr) molybdates

The microcrystalline TlNd(MoO₄)₂ and TlPr(MoO₄)₂ molybdates have been prepared with solid state synthesis on the same synthesis route. The final products have been studied by XRD and SEM. Vibrational properties have been evaluated with Raman spectroscopy. More than 20 narrow Raman lines have been observed in the experimental spectrum of the microcrystals. The most intensive lines related to breathing vibrations of MoO₄ tetrahedra have been found at 904 and ∼930 cm⁻¹. The earlier proposed empirical relation between MoO bond length and stretching mode wavenumber has been tested by the comparative analysis for a suite of sixteen complex molybdates. This well-known relation is found to be unusable for molybdates containing different cations in the crystal lattice.     

离子束溅射法制备碳氮薄膜及其结构表征

采用离子束溅射沉积技术,对不同氮离子束能量情况下制备的氮化碳薄膜,进行了拉曼(Raman)和红外光谱(FT-IR)分析,并采用透射电子显微镜(TEM)分析其表面形貌,研究所制备薄膜的化学组成和键合结构。结果显示:随着氮离子束能量增大,氮碳薄膜的沉积速率减小,薄膜结构中sp2含量增大,薄膜有序度增加,另外薄膜结构的团簇尺寸大幅下降,团簇趋于均匀分布。