Noble metal nanoparticles exhibit excellent properties in photocatalysis, metal-enhanced fluorescence, and surface-enhanced Raman scattering (SERS) due to their unique surface plasmon resonance (SPR). Research shows that coating the surface of precious metal nanoparticles with shell materials can not only enhance their chemical stability but also impart new properties. Among them, SiO2 shell is widely used as a shell material because of its high specific surface area, good biocompatibility, adjustable porosity, optical transparency and other advantages. Noble metal SiO2 core-shell structure nanoparticles have been widely studied.
Triboelectric nanogenerators (TENGs) can effectively convert low-frequency vibrations into electrical energy and have been a hot research topic today. Research has found that SiO2 as a shell structure can prevent charge leakage caused by metal nanoparticles, thereby improving TENG output performance. At the same time, using the surface plasmon effect generated by core-shell AgSiO2 NPs, the output performance of TENG can be improved several times compared with traditional TENG.
In addition, the researchers utilized three different shell thicknesses of AgSiO2 NPs to explore their impact on the TENG output performance. With a shell thickness of 6nm and a doping amount of 0.4wt%, the TENG achieved a peak output power of 70mW, an output current of 248μA, and an output voltage of more than 1kV, far exceeding traditional TENGs. Benefiting from such high power, the TENG lights up 300 LEDs and realizes the power-off of the wireless sensing system. It is worth mentioning that researchers combined high-performance TENG with traditional Chinese acupuncture to broaden the application scope of TENG.
SiO2 replaces ion passivation to help improve CZTSSe battery efficiency.
Cu2ZnSn(S, Se)4 (CZTSSe) is a low-cost, pollution-free, green, and environmentally friendly photovoltaic material. Its device performance is stable and has attracted widespread attention from the international photovoltaic community. The researchers applied an additional plasmonic local electric field at the CdS/CZTSSe interface by orderly assembling AuSiO2 NPs onto the aminosilane-modified absorbing layer. Research shows that this additional local electric field enhances the interface electrostatic potential (Velec) and optimizes the charge extraction and recombination process, resulting in a significant improvement in the open circuit voltage (Voc) and short circuit current (Jsc) of the battery. The battery efficiency increases from 10.19% to 11.50%.
This work demonstrates that plasmonic local electric field-induced interfacial charge extraction and electrostatic force coupling are key factors in achieving high PCE rather than light absorption. In addition, changing the surface absorber through a two-dimensional AuSiO2 NPs array replaces the commonly used ion passivation method, providing a new strategy for the high-quality preparation of CZTSSe photovoltaic p-n junctions.
SiO2 facilitates rapid detection of Alzheimer's disease
A large number of studies have shown that AβOs are an important cause of synaptic damage and cognitive impairment in Alzheimer's disease. Recently, researchers have manufactured a glucose-based liposome portable passive sensor that recognizes and interacts with AβO through a specific inducer (G-Lip-Apt) on the liposome, thereby achieving the purpose of rapid detection of AβO. In the presence of AβO, AβO can bind to the inducer G-Lip-Apt on liposomes. Subsequently, single-stranded DNA-modified Fe3O4SiO2/NH2 designed to be partially complementary to the AβO inducer was introduced and further connected through double-stranded complementary pairing.
Then TritonX-100 is added, the glucose encapsulated in the liposomes is released, and the release amount is measured with a blood glucose meter. The results showed that a good linear correlation between glucose and AβO was obtained in the concentration range of 5.0-1000 nM, and the limit of detection (LOD) of AβO was calculated to be 2.27 nM. The portable electrochemical strategy developed in this study has high sensitivity, high selectivity, and high accuracy and can be successfully applied to AβO analysis and detection.
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