1993年诺贝尔化学奖得主及其贡献

瑞典皇家科学院于1993年10月13日宣布将该年度诺贝尔化学奖授予美国化学家卡里·穆利斯(Kary B. Mullis)和加拿大籍英国化学家迈克尔·史密斯(Michael Smith),以表彰他们在遗传领域研究中各自取得突破性成就。     

基于实验探究的整合教学模式案例研究

以“二氧化碳的性质和用途”为教学案例,设计了家庭实验和分组实验等实验探究活动,改进了传统的演示实验与板书,并对上述内容进行了整合研究,形成了基于实验探究的整合教学模式。     

Synthesis and characterization of semicarbazone metal complexes of Sn(IV) and Zr(IV)

Three semicarbazonyl ligands were synthesized and used to form six novel organometallic complexes with Ph2SnCl2 and Cp2ZrCl2. All these complexes were characterized by IR,1H NMR,MS and elemental analysis.     

乙烯与乙烯工业

乙烯是烯烃同系列中的第一个成员,是产量最大的有机化工产品。本文从乙烯的来源、性质、用途等方面展示了乙烯在石油化学工业中的重要地位;我国乙烯工业的概貌。乙烯工业产品对环境的影响及其对策。     

Photoconductive multi-layer graphene photodetectors fabricated on etched silicon-on-insulator substrates

Recently, graphene-based photodetectors have been rapidly developed. However, their photoresponsivities are generally low due to the weak optical absorption strength of graphene. In this paper, we fabricate photoconductive multi-layer graphene(MLG) photodetectors on etched silicon-on-insulator substrates. A photoresponsivity exceeding 200 A·W-1is obtained, which enables most optoelectronic application. In addition, according to the analyses of the high photoresponsivity and long photoresponse time, we conclude that the working mechanism of the device is photoconductive effect. The process of photons conversion into conducting electrons is also described in detail. Finally, according to the distinct difference between the photoresponses at 1550 nm and 808 nm, we estimate that the position of the trapping energy is somewhere between 0.4 e V and 0.76 e V, higher than the Fermi energy of MLG. Our work paves a new way for fabricating the graphene photoconductive photodetectors.     

万能抗氧化剂——硫辛酸

针对国际上逐渐兴起的“硫辛酸热”,简要介绍了有“万能抗氧化剂“美誉的硫辛酸的性质、生物学功能、合成方法及其应用。