Synthesis Of Cadmium Sulfide And Zinc Sulfide Nano-materials By Bovine Serum Albumin Protein

Recently,synthesis and characterization ofⅡ-Ⅵgroup semiconductor nanomaterials are of great interest.Because of quantum size effect they have tunable optoelectronic property and attractive optical property,could used as active components in functional nanocomposites,chemical sensors,biomedicine,optoelectronics,and nanoelectronics.There are many methods to synthesize 1D nanoscale materials including nanotubes,nanowires,nanobelts,nanorods,and nanomulti-armed,such as vapor-liquid-solid,solvothermal route,template method.Studying anisotropic optoelectronic effects,including polarized emission,and quantum rod(QR) lasing,may used as building blocks for complex nanodevice and nanoequipment.As known not only these high temperature and expensive chemical reagents make experiment process difficulty and high cost but also the chemical synthesis of metal nanoparticles generally involves the reduction of metal ions using reducing agents which are highly reactive chemicals and result in environmental and biological pollution and dangerIn our work,we used mimic biomineralization which was under inherently benign conditions(low temperature,ambient pressure,and near-neutral pH) to prepare highly ordered and monodisperse CdS,ZnS nanorods and network nanowires in the BSA aqueous solution at room temperature and physiological temperature respectively.The CdS,ZnS nanorods and nanowires showed cubic zinc blende structure with a high degree of crystallinity and illuminated the excellent fluorescence and good conductivity.Interesting mechanism is discussed for the formation of the semiconductor nanomaterials.Such a process is very simple and controllable,and the high-temperature,anhydrous anaerobic and toxic organic solvents involved in traditional experiment can be avoidedIn this paper,the main work and the main results obtained are as follows: 1.One-dimensional CdS nanowires and nanorods were prepared in aqueous solutions through by Bovine Serum Albumin protein.The monodisperse nanowires and nanorods are highly order.At 20℃of the reaction temperature,we use BSA-chain secondary structureα-helices as template to synthesis CdS nanorods with sizes about 30 nm in diameter and 250 nm in length,At 50℃of the reaction temperature,we use BSA-chain secondary structure random coil as template to synthesis CdS network nanowires with about 2～3 um in lengthThe CdS nanorods and nanowires showed cubic zinc blende structureThe UV-vis absorption and PL spectra of the product show that:with intrinsic fluorescence centered at about 515 nm compared,the main fluorescence emission peak centered at about 550 nm have a big red-shift and enhance more Intensity.The excellent fluorescent property has new applications in quantum fluorescence and biological markers fieldCdS nanowires have excellentⅠ-Ⅴconductivity and Sensitive response to UV.In the dark state,Schottky barrier appear between the metal probe and semiconductor; under ultraviolet irradiation,CdS nanowires have a clear response and show ohmic characteristics.Ⅰ-Ⅴtest results show that:This material has a strong sensitivity to light, may have some value in the photosensitive devicesThe growth mechanism of nanorods and nanowires have been explain2.One-dimensional ZnS nanowires and nanorods and nanobranches were prepared in aqueous solutions through by Bovine Serum Albumin protein.The monodisperse nanowires and nanorods are highly order.At 20℃of the reaction temperature,we use BSA-chain secondary structureα-helices as template to synthesis ZnS nanorods with sizes about 25 nm in diameter and 250 nm in length,At 50℃of the reaction temperature,we use BSA-chain secondary structure random coil as template to synthesis ZnS network nanowires with about 1～2 um in length.At 20℃of the reaction temperature,at low concentration of BSA,using -OH,-NH,-SH and other polar functional groups contained in the BSA molecular to induce and organize ZnS branch nanocrystal,main branch and branches in the hierarchical dendrite nanocrystal with about 3 um in length.The ZnS nanorods and nanowires showed cubic zinc blende structure.The UV-vis absorption and PL spectra of the product show that:the main fluorescence emission peak centered at about 420 nm,which is surface state launchZnS nanowire in the dark state,showing Schottky barrier appear between the metal probe and semiconductor may have some value in the photosensitive deviceThe growth mechanism of ZnS nanorods and nanowires have been explained...