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Formation of luminescent and nonluminescent silver nanoparticles in silicate glasses by near-infrared femtosecond laser pulses and subsequent thermal treatment: the role of halogenides
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2016
Year
Materials ScienceSilver-containing Silicate GlassesSilver NpsEngineeringNanoclusterNanomaterialsOptical PropertiesLuminescent GlassSilver NanoparticlesApplied PhysicsOptical GlassGlass MaterialChemistrySubsequent Thermal TreatmentLuminescence PropertyOptoelectronicsSilicate GlassesNonluminescent Silver Nanoparticles
It is shown experimentally that the near-infrared femtosecond laser irradiation and subsequent thermal treatment of silver-containing silicate glasses result in the formation of luminescent silver molecular clusters (MCs) and silver nanoparticles (NPs). In glasses doped also with halides (mostly Br), the nonluminescent silver NPs are formed because of the presence of halogenide shells on their surfaces, whereas, in glasses with no Br ions, the luminescent silver nanoparticles provides an emission in the 600- to 750-nm range. Two possible mechanisms of luminescence of glass with silver NPs are considered: (i) luminescence of silver NPs without halogenide shell and (ii) the luminescence of silver MCs Agm (m=1 to 4) remaining even after the formation of silver NPs.