RESUMO
This Letter highlights a cost-effective, simple, and rapid one-step process leading to the (Sr0.84Lu0.16) F2.16 glass ceramic in a completely new perfluoride system. The mechanism was demonstrated clearly. This material shows high transparency in the UV (0.35 µm) range up to far-IR (10.8 µm). In addition, low phonon energy, as well as good mechanical properties, chemical durability, spectral performance, and long lifetime (7.2 ms) of Er3+:2.7 µm are also possessed by this material. This Letter effectively breaks through the performance limitation of a glass matrix on fluoride crystallites in glass ceramics for the first time, to the best of our knowledge. Meanwhile, it also provides a promising optical material for windows and lasers by a simple and cheap method.
RESUMO
Herein, a facile approach for shape-controlled gold nanoparticle (AuNP) decorated thionine-MoS2 nanocomposites (AuNP-Thi-MoS2) had been reported by using the synergistic effect of MoS2 and Thi. Thi was not only used as an electrochemical indicator, but also as a reducing agent to tune the resulting morphologies of AuNPs. With the ratio of MoS2/Thi decreasing, the shapes of AuNPs changed from spherical, triangle, clover-like to flower-like nanostructures. TEM, XRD and XPS were employed to characterize the formation and chemical composition of AuNP-Thi-MoS2 nanocomposites. On the basis of synthesis, a MoS2-based label-free electrochemical immunosensor had been designed to detect carcino-embryonic antigen (CEA). The proposed immunosensor could detect as low as 0.52 pg mL(-1) CEA with excellent selectivity. Moreover, the expected immunosensor showed high stability and excellent reproducibility, which could detect CEA in human serum with satisfactory results. Therefore, the AuNP-Thi-MoS2 nanocomposites may be considered as a candidate sensing platform for fabrication of simple, label-free and ultrasensitive electrochemical sensors.
