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Optical bonding of tellurite glass film on silicate glass
摘要： Tellurite glass thin film was successfully bonded on a silicate glass substrate by the direct bonding (DB) method. Glass film (thickness 1-3 μm) was fabricated by the glass blowing technique and the DB process was performed at room temperature at relative humidity (RH) of 62% or 15%. The surface adhesive strengths of the glass films bonded at 15% and 62% RH were measured as 250 and 96 mJ/m2 respectively by the Obreimoff-Metsik method. The hydroxyl (-OH) functional groups on the interface between the film and silicate glass were analyzed by Fourier transform infrared spectroscopy. The major bonding forces between the tellurite thin film and silicate glass were hydrogen bonds at 62% RH and bonds between Te on the tellurite glass and O on the silicate glass were concerned at 15% RH. These forces, contributed by Si-OH, were important for bond formation at 62%. The large amounts of water and OH groups on the silicate glass, determined by thermogravimetric analysis, indicated a weaker bonding process at 62% RH. This work will contribute toward reliable, high-integrity components for integrated optical circuits, which are increasingly needed for high-throughput data transfer.
关键词： glass thin film,tellurite glass,hydroxyl group,adhesive strength,direct bonding
更新于2025-09-04 15:30:14
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A Highly Fluorescent and Photoresponsive Polymer Gel Consisting of Poly(acrylic acid) and Supramolecular Cyanostilbene Crosslinkers
摘要： A poly(acrylic acid)-based polymer gel exhibiting strong fluorescence and high photoresponsibility is prepared by using a cyanostilbene derivative as a self-assembling supramolecular crosslinking agent, which generates conceptually new multiple hydrogen bonds in the gel system. This polymer gel in ethanol shows the gel-to-sol transition upon UV light irradiation with concomitant fluorescence color and intensity changes, which are attributed to the trans-to-cis photoisomerization of the supramolecular crosslinkers. Aggregation-induced enhanced emission (AIEE) behavior of the trans-cyanostilbene derivative enables a highly fluorescent polymer gel (ΦF = 0.68) with green color (λem = 541 nm), which can be switched into a blue fluorescent sol (λem = 506 nm and ΦF = 0.12) upon UV irradiation.
关键词： polymer gels,fluorescence switching,photoisomerization,gel-to-sol transition,hydrogen bonding
更新于2025-09-04 15:30:14