纳米传感 F. Favier et al.,Science, 293: 2227, 2001 Hydrogen Sensors / Palladium Mesowire Arrays J. Kong et al., Science, 287: 622, 2000 AFM image of a metal/S-SWNT/metal sample used for the experiments. Nanotube diameter is ~1.8 nm. The metal electrodes consist of 20-nm-thick Ni, with 60-nm-thick Au on top. Semi-conducting Nanotube Molecular Wires as Chemical Sensors for NH3 and NOx
纳米传感 F. Favier et al.,Science, 293: 2227, 2001 Hydrogen Sensors / Palladium Mesowire Arrays J. Kong et al., Science, 287: 622, 2000 AFM image of a metal/S-SWNT/metal sample used for the experiments. Nanotube diameter is ~1.8 nm. The metal electrodes consist of 20-nm-thick Ni, with 60-nm-thick Au on top. Semi-conducting Nanotube Molecular Wires as Chemical Sensors for NH3 and NOx
Y. Cui et al. Science, 293:1289, 2001 Electronically-based Nano-sensors for Highly Sensitive and Selective Detection of Chemical Species 纳米传感
Y. Cui et al. Science, 293:1289, 2001 Electronically-based Nano-sensors for Highly Sensitive and Selective Detection of Chemical Species 纳米传感
第二节 电位分析法 一、化学电池与电极电位 Zn Cu Zn|ZnSO4 (x mol/L)||CuSO4 (y mol/L) |Cu E电池 = φ阴 – φ阳 + φ j -IR φ = φ o + 0.059/n lg n+ e 当Cu2+溶液的浓度 确定后,根据电动势的改 变,即可确定Zn2+溶液浓 度的变化
第二节 电位分析法 一、化学电池与电极电位 Zn Cu Zn|ZnSO4 (x mol/L)||CuSO4 (y mol/L) |Cu E电池 = φ阴 – φ阳 + φ j -IR φ = φ o + 0.059/n lg n+ e 当Cu2+溶液的浓度 确定后,根据电动势的改 变,即可确定Zn2+溶液浓 度的变化
二、玻璃膜电极 实验发现,插在两个具有不同pH值的溶液间的 薄而导电的玻璃薄膜两侧有电位差现象,这一电势可 以通过在每个溶液中各放一支参比电极的方法加以测 量。 玻 璃 薄 膜 a1 a2 饱 和 甘 汞 电 极 Ag-AgCl 电极
二、玻璃膜电极 实验发现,插在两个具有不同pH值的溶液间的 薄而导电的玻璃薄膜两侧有电位差现象,这一电势可 以通过在每个溶液中各放一支参比电极的方法加以测 量。 玻 璃 薄 膜 a1 a2 饱 和 甘 汞 电 极 Ag-AgCl 电极
玻璃薄膜 a1 a2 饱和甘汞电极 Ag -AgCl 电极
玻璃薄膜 a1 a2 饱和甘汞电极 Ag -AgCl 电极