7-hydroxyquinoline (7-HQ) is a kind of organic molecule with excited state proton transfer (ESPT) effect,and can be used as the material for all optical switching.This optical switching takes place via the ESPT effect...7-hydroxyquinoline (7-HQ) is a kind of organic molecule with excited state proton transfer (ESPT) effect,and can be used as the material for all optical switching.This optical switching takes place via the ESPT effect depending on its intermolecular hydrogen bond formed with the solvent,and can have the effect of all optical switching.7-HQ can not form intermolecular hydrogen bond with dimethyl sulfoxide (DMSO),so 7-HQ in DMSO solution cannot display the ESPT effect.However,after the solution was radiated by an UV laser, we found that 7-HQ could have ESPT effect.This phenomenon is reported and the mechanism is investigated for the first time in this paper.展开更多
Metal-coated fiber Bragg grating（FBG）temperature sensors were prepared via electroless nickel（EN）plating and tin electroplating methods on the surface of normal bare FBG.The surface morphologies of the metal-coate...Metal-coated fiber Bragg grating（FBG）temperature sensors were prepared via electroless nickel（EN）plating and tin electroplating methods on the surface of normal bare FBG.The surface morphologies of the metal-coated layers were observed under a metallographic microscope.The effects of pretreatment sequence,pH value of EN plating solution and current density of electroplating on the performance of the metal-coated layers were analyzed.Meanwhile, the Bragg wavelength shift induced by temperature was monitored by an optical spectrum analyzer.Sensitivity of the metal-coated FBG（MFBG）sensor was almost two times that of normal bare FBG sensor.The measuring temperature of the MFBG sensor could be up to 280℃,which was much better than that of conventional FBG sensor.展开更多
文摘7-hydroxyquinoline (7-HQ) is a kind of organic molecule with excited state proton transfer (ESPT) effect,and can be used as the material for all optical switching.This optical switching takes place via the ESPT effect depending on its intermolecular hydrogen bond formed with the solvent,and can have the effect of all optical switching.7-HQ can not form intermolecular hydrogen bond with dimethyl sulfoxide (DMSO),so 7-HQ in DMSO solution cannot display the ESPT effect.However,after the solution was radiated by an UV laser, we found that 7-HQ could have ESPT effect.This phenomenon is reported and the mechanism is investigated for the first time in this paper.
基金the National Natural Science Foundation of China(No.60777038).
文摘Metal-coated fiber Bragg grating（FBG）temperature sensors were prepared via electroless nickel（EN）plating and tin electroplating methods on the surface of normal bare FBG.The surface morphologies of the metal-coated layers were observed under a metallographic microscope.The effects of pretreatment sequence,pH value of EN plating solution and current density of electroplating on the performance of the metal-coated layers were analyzed.Meanwhile, the Bragg wavelength shift induced by temperature was monitored by an optical spectrum analyzer.Sensitivity of the metal-coated FBG（MFBG）sensor was almost two times that of normal bare FBG sensor.The measuring temperature of the MFBG sensor could be up to 280℃,which was much better than that of conventional FBG sensor.
