Preparation of silver nanotube by direct chemical reduction of silver ammonia complex ions on templates of array holes of microstructure polymer optical fiber are studied. Firstly, silver - ammonia complex ions is physically absorbed on the surfaces of array microtubes of MPOF. Secondly, the heating promotes in-situ redox reaction of silver-ammonia complex ions and glucose on the surfaces of array holes. Thirdly, silver nucleations on the holes surfaces and aggregation limited dispersion leads to formation of silver nanoparticles. By adjusting the reaction condition of silver mirror reaction in the air holes of MPOF, nanotubular or nanoisland shape modified Ag-MPOF is obtained. SEM images show that when the concentration of reaction solution is higher (silver ammonia 0.5M, glucose 0.25M), the morphology of silver is tubular. This Ag-MPOF composite fiber has favourable conductivity and could be used as array electrode in electroanalysis. The results show that this fiber display high active in sensing nitrate or nitrite ions which usually cause cancers in waste water. When the concentration of reaction solution is lower(silver ammonia 0.1 M, glucose 0.05M), the Ag-MPOF with island-like silver nanoparticles is obtained. The fluorescence of dye molecules could be greatly enhanced if it is put into the modified holes of this Ag-MPOF.
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