The electric and dielectric properties of metalloprotein, azurin, were studied at real molecular level by using conducting atomic force microscopy(C-AFM). Under a force lower than 2 nN, dielectric breakdown was observ...The electric and dielectric properties of metalloprotein, azurin, were studied at real molecular level by using conducting atomic force microscopy(C-AFM). Under a force lower than 2 nN, dielectric breakdown was observed. When reliable electrical contact between electrodes and protein is achieved under a force greater than 5 nN, well-behaved current-voltage characters are revealed, and dependent on the force load.展开更多
开发了基于原子力显微镜(Atomic force microscope,AFM)的四电极微探针局域电导率测量技术。四电极AFM探针最小的电极间距为300nm,安装了这种新型四电极微探针的AFM系统既保持表面微观形貌测量能力,又可以在实施表面形貌扫描的同时测定...开发了基于原子力显微镜(Atomic force microscope,AFM)的四电极微探针局域电导率测量技术。四电极AFM探针最小的电极间距为300nm,安装了这种新型四电极微探针的AFM系统既保持表面微观形貌测量能力,又可以在实施表面形貌扫描的同时测定局域电导率。利用该技术精确测量了厚度为6.0μm的铝薄膜和厚度为350nm的透明导电氧化铟薄膜(Indium tin oxide,ITO)的局域电导率,试验结果证明基于AFM的四电极微探针技术在亚微米局域电导率测量方面的能力。展开更多
The study of size effect of conductivity of conducting polymer nanowires can be significant not only in the instruction of fabrication of the devices with nanodimension but also in basic research of inherence of nanom...The study of size effect of conductivity of conducting polymer nanowires can be significant not only in the instruction of fabrication of the devices with nanodimension but also in basic research of inherence of nanomaterials. PANI nanowires was fabricated in AAO templates by potentiostatic method. A new strategy of chemical modification of AAO template was introduced to prepare nanowires with smaller diameter. FTIR and contact angle measurements were used to characterize the modification. Tunneling Electron Microscopy results showed that the smaller PANI nanowires in diameter can be obtained in surfactant modified AAO templates. Conductivity of single PANI nanowire had been measured by Conductive Atomic Force Microscopy. The results displayed that the conductivity of PANI nanowire increase while the decrease of the diameter of PANI nanowires, which was called size effect of conductivity of PANI nanowires. The size effect had been attributed to order polymer chains orientation of PANI nanowire, which had been confirmed by electron diffraction diagrams.展开更多
PANI nanodots array was fabricated in AAO template with potentiostatic method in a short time.The topographic image of PANI nanodots array was characterized by scanning electron microscopy(SEM) and atomic force micros...PANI nanodots array was fabricated in AAO template with potentiostatic method in a short time.The topographic image of PANI nanodots array was characterized by scanning electron microscopy(SEM) and atomic force microscopy(AFM).The I-V characteristics of conducting PANI nanodots array was measured with conducting atomic force microscope(C-AFM) in atmosphere at room temperature.Coulomb staircase phenomena was observed in the I-V curves.展开更多
文摘The electric and dielectric properties of metalloprotein, azurin, were studied at real molecular level by using conducting atomic force microscopy(C-AFM). Under a force lower than 2 nN, dielectric breakdown was observed. When reliable electrical contact between electrodes and protein is achieved under a force greater than 5 nN, well-behaved current-voltage characters are revealed, and dependent on the force load.
文摘开发了基于原子力显微镜(Atomic force microscope,AFM)的四电极微探针局域电导率测量技术。四电极AFM探针最小的电极间距为300nm,安装了这种新型四电极微探针的AFM系统既保持表面微观形貌测量能力,又可以在实施表面形貌扫描的同时测定局域电导率。利用该技术精确测量了厚度为6.0μm的铝薄膜和厚度为350nm的透明导电氧化铟薄膜(Indium tin oxide,ITO)的局域电导率,试验结果证明基于AFM的四电极微探针技术在亚微米局域电导率测量方面的能力。
文摘The study of size effect of conductivity of conducting polymer nanowires can be significant not only in the instruction of fabrication of the devices with nanodimension but also in basic research of inherence of nanomaterials. PANI nanowires was fabricated in AAO templates by potentiostatic method. A new strategy of chemical modification of AAO template was introduced to prepare nanowires with smaller diameter. FTIR and contact angle measurements were used to characterize the modification. Tunneling Electron Microscopy results showed that the smaller PANI nanowires in diameter can be obtained in surfactant modified AAO templates. Conductivity of single PANI nanowire had been measured by Conductive Atomic Force Microscopy. The results displayed that the conductivity of PANI nanowire increase while the decrease of the diameter of PANI nanowires, which was called size effect of conductivity of PANI nanowires. The size effect had been attributed to order polymer chains orientation of PANI nanowire, which had been confirmed by electron diffraction diagrams.
文摘PANI nanodots array was fabricated in AAO template with potentiostatic method in a short time.The topographic image of PANI nanodots array was characterized by scanning electron microscopy(SEM) and atomic force microscopy(AFM).The I-V characteristics of conducting PANI nanodots array was measured with conducting atomic force microscope(C-AFM) in atmosphere at room temperature.Coulomb staircase phenomena was observed in the I-V curves.
