电纺氧化硅凝胶亚微米光波导

利用静电纺丝技术制备了有机硅微纳凝胶光纤.在酸性条件下对正硅酸乙酯(TEOS)和正辛基三乙氧基硅烷(Octyl-triEOS)进行水解缩聚,同时掺杂氧气敏感荧光指示剂tris(4,7-diphenyl-1,10-phenanthroline) ruthenium( Ⅱ) chlorideRu(dpp)3Cl2],反应形成黏稠的溶胶溶液.然后,在10 kV高压静电场作用下对溶胶进行静电纺丝,获得直径为900 nm的凝胶纤维,并对拉锥后的多模光纤与电纺制备的微纳光波导纤维进行倏逝场光耦合,同时检测该纤维的氧气传感特性.实验结果表明:电纺制备的纤维具有光滑的表面结构,直径均匀,能够与拉锥后的光纤进行强烈的倏逝场耦合,同时激发纤维内部荧光指示剂,发射595 nm荧光.该纤维具有明显的氧气敏感性,在氧气浓度为0％～100％(体积比)时,荧光淬灭程度I0/I与氧气浓度呈线性关系,响应时间低于100 ms.

Electrospun silicon gel submicrometer optical waveguides

A method of electrospinning was established to fabricate organic silicon gel submicrometer optical fibers.First,Tetraethyl orthosiliate(TEOS) and n-Octyltriethoxysilane(Octyl-triEOS) were hydrolyzed and polymerized under an acidity condition.Simultaneously,the fluorescence indicator of tris(4,7-diphenyl-1,10-phenanthroline) ruthenium(II) chloride Ru(dpp)3Cl2] was added into the solution to form a viscous sol solution.Then,the electrospun fiber with a diameter of 900 nm was obtained by electrospinning the sol solution under a high voltage of 10 kV in the electrostatic field.A tapered multimode optical fiber was coupled with the electrospun optical waveguide fiber through an evanescent field and the sensing characteristic of the electrospun fiber was tested at the same time.Experimental results indicate that the electrospun(4,7-diphenyl-1,10-phenanthroline) ruthenium(II) chloride doped silicon gel fiber has a smooth surface and a uniform diameter.The light can be highly coupled into the electrospun fiber through the evanescent field and can excite the indicator molecules in the fiber to emit a 595 nm fluorescence.This fiber is sensitive to the oxygen gas in the range of 0~100 %(volume ratio),and the quenching degree of I0/I is linear to the concentration of oxygen in the range.The response time is below 100 ms.