N∶ZnO薄膜的受主性质研究

使用溶胶-凝胶法制备N∶ZnO薄膜,用X射线衍射仪(XRD)对晶体结构进行表征,用扫描电子显微镜(SEM)观察薄膜表面形貌,用荧光光谱仪测量低温(8K)及变温条件(8～200K)下的光致发光(PL)光谱。分析了各个发射峰的形成机理,通过薄膜缺陷态发光和受主能级的关联性,计算出了N作为受主所需电离能的大小在0.255～0.31eV范围内。研究结果为以后P型ZnO薄膜的制备和研究提供了依据。     

单片机教学系统驱动芯片测试装置的设计

针对DTHS-A单片机实验平台的日常维护需要设计了该测试装置,该装置能够快速的检测实验电路中驱动芯片是否正常,与传统方法相比,节约了维护的时间,提高了检测效率.该装置以STC15F2K61S2为控制核心,通过按键与拨码开关来选择对应芯片,通过液晶显示与LED指示芯片是否正常,同时具有过流保护功能.     

激光烧结Sr_(1.86)Ca_(0.14)NaNb_5O_(15)无Pb压电陶瓷

采用激光烧结技术,制备出相对密度为97.5%的Sr1.86Ca0.14NaNb5O15(SCNN)无Pb压电陶瓷。最佳烧结条件为:激光烧结功率密度为1.99W/mm2;激光烧结时间为60s;激光功率密度升降速率为0.50W/mm2.min。与传统炉烧SCNN陶瓷相比,激光烧结SCNN陶瓷室温下1MHz的介电常数κ从1312增长到1419,机电耦合系数k33从17%增长到了27%,压电常数d33从60pC/N提高到93pC/N。扫描电镜(SEM)观测发现:与传统炉烧陶瓷相比,激光烧结SCNN陶瓷的晶粒尺寸较小,气孔较少,Na挥发较少;陶瓷片的X射线衍射(XRD)分析表明,激光烧结陶瓷的晶粒具有一定程度的取向生长。     

Influence of AIN protective film thickness on the hardness and electrophotographic properties of organic photoconductors

The deposition of a protective film to increase the hardness of an organic photoconductor (OPC) surface is an effective method to lengthen the lifetime of the OPC. In this work, A1N protective films were deposited onto OPC samples by rf reactive magnetron sputtering with low substrate temperature. The A1N films were deposited with optimized sputtering conditions and exhibited very high transmissivity in the visible wavelength range 300-800 nm. The films caused a remarkable increase in the hardness of the OPC surface, by between 32 and 62%. The acceptance voltage, dark decay rate, photodischarge rate, difference between the residual potential and the acceptance voltage of the OPC protected by A1N film were improved. These results show A1N is a suitable protective film for OPC.     

高声速（100）择优取向AIN薄膜的制备和性能研究

采用射频磁控溅射法,通过改变工艺参数在n型（100）Si片上制备了表面粗糙度小、以（100）面择优取向的AlN薄膜。研究了高温退火、N2结尾等工艺对AIN薄膜择优取向的影响。结果表明,增大工作气压有利于薄膜（100）面择优取向,但是随着工作气压升高薄膜沉积不均匀,通过退火可以减少这种缺陷;N2-Ar比低有利于（100）...     

Physicochemically Stable Polymer‐Coupled Oxide Dielectrics for Multipurpose Organic Electronic Applications

A chemically coupled polymer layer is introduced onto inorganic oxide dielectrics from a dilute chlorosilane‐terminated polystyrene (PS) solution. As a result of this surface modification, hydrophilic‐oxide dielectrics gain hydrophobic, physicochemically stable properties. On such PS‐coupled SiO₂ or AlO_x dielectrics, various vacuum‐ and solution‐processable organic semiconductors can develop highly ordered crystalline structures that provide higher field‐effect mobilities (μ_FETs) than other surface‐modified systems, and negligible hysteresis in organic field‐effect transistors (OFETs). In particular, the use of PS‐coupled AlO_x nanodielectrics enables a solution‐processable triethylsilylethynyl anthradithiophene OFET to operate with μ_FET ～ 1.26 cm² V^?1 s^?1 at a gate voltage below –1 V. In addition, a complementary metal‐oxide semiconductor‐like organic inverter with a high voltage gain of approximately 32 was successfully fabricated on a PS‐coupled SiO₂ dielectric.     

有线数字电视长跨距光纤传输中拉曼放大器的应用

有线数字电视信号在长距离光纤传输中C／N是一个重要指标，普通EDFA单独使用时无法保证C／N值，因此引入RFA，并分析了RFA的工作原理和特点。     

数字电视机顶盒检测信息解析及应用

详细介绍了数字电视机顶盒的检测信息和数字电视系统的主要技术参数,并通过具体案例阐述如何应用检测信息进行分配网络的维修。     

氮气保护对无铅焊接工艺温度窗口的影响

无铅化电子组装中无铅焊料的高熔点、低润湿性给实际生产带来了很大挑战。为了改善润湿性,可适当提高焊接温度,但由于PCB及元件的工艺温度限制,导致了焊接工艺温度窗口变窄。氮气保护可以改善无铅焊料润湿性、防止氧化、提高焊接品质,更重要的是可以降低焊接峰值温度,扩大焊接工艺温度窗口。     

Multifunctional Up‐Converting Nanocomposites with Smart Polymer Brushes Gated Mesopores for Cell Imaging and Thermo/pH Dual‐Responsive Drug Controlled Release

Multifunctional nanocarriers based on the up‐conversion luminescent nanoparticles of NaYF₄:Yb³⁺/Er³⁺ core (UCNPs) and thermo/pH‐coupling sensitive polymer poly[(N‐isopropylacrylamide)‐co‐(methacrylic acid)] (P(NIPAm‐co‐MAA)) gated mesoporous silica shell are reported for cancer theranostics, including fluorescence imaging, and for controlled drug release for therapy. The as‐synthesized hybrid nanospheres UCNPs@mSiO₂‐P(NIPAm‐co‐MAA) show bright green up‐conversion fluorescence under 980 nm laser excitation and the thermo/pH‐sensitive polymer is active as a “valve” to moderate the diffusion of the embedded drugs in‐and‐out of the pore channels of the silica container. The anticancer drug doxorubicin hydrochloride (DOX) can be absorbed into UCNPs@mSiO₂‐P(NIPAm‐co‐MAA) nanospheres and the composite drug delivery system (DDS) shows a low level of leakage at low temperature/high pH values but significantly enhanced release at higher temperature/lower pH values, exhibiting an apparent thermo/pH controlled “on‐off” drug release pattern. The as‐prepared UCNPs@mSiO₂‐P(NIPAm‐co‐MAA) hybrid nanospheres can be used as bioimaging agents and biomonitors to track the extent of drug release. The reported multifunctional nanocarriers represent a novel and versatile class of platform for simultaneous imaging and stimuli‐responsive controlled drug delivery.