![]() However, the extremely short reaction times of microwave synthesis, when combined with well-established synthesis routes, such as, coprecipitation, have been proven to be highly suitable for the synthesis of colloidal NPs. įrequently, studies on metal NP synthesis rely on thermal, electrochemical, sonochemical and photochemical reduction techniques. Sensor properties of core–shell NPs for surface enhanced Raman spectroscopy (SERS) applications have also been explored. A shell thickness dependent antibacterial activity was reported by Yang et al. ![]() could demonstrate the use of core–shell NPs for two photon imaging of bacteria utilizing near infra-red femtosecond laser pulses. Furthermore, due to their large enhancement factor and strong antibacterial activity, Ding et al. As a consequence, NPs have, e.g., been reported to show a negligible toxicity to human dermal fibroblasts. NPs with Ag-like optical properties show, at the same total metal ion concentrations, a lower effective silver concentration compared to AgNPs of the same size. Core–shell bimetallic plasmonic NPs consisting of gold NPs as core material and silver as shell have been widely reported in literature due to the unique properties exhibited when the core or the shell is rationally tuned. ![]() In comparison, silver NPs provide higher extinction coefficients, catalytic properties and antimicrobial activity, but these properties are associated with a rather high cytotoxicity. For instance, literature data has shown that gold NPs are easily tailored in terms of homogeneity and biocompatibility, however they provide, e.g., no antimicrobial activity. These include, e.g., an increased enhancement factor for sensing applications or to establish efficient catalytic properties. These hybrid NPs provide the synergetic effect of the individual constituent metals, originating from plasmonic coupling effects, which help to access a variety of different attractive properties of core–shell NPs. Such a multifunctional fluorescent probe shows advantages of strong magnetism for sample separation, sensitive response for sample detection, and low toxicity without injury to cellular components.Bimetallic core–shell nanoparticles (NPs) have generated increasing research attention in recent years. This magnetic and sensitive FRET probe was used to detect three kinds of primary biological thiols (glutathione, homocysteine, and cysteine) in cells. Thus, a FRET probe can be designed on the basis of the quenching effect of Au NPs on the fluorescence of Fe 3O nanocomposites. ![]() Au NPs were then loaded onto the surface of the PFR shell by electric charge absorption between Fe 3O and Au NPs after modifying the Fe 3O nanocomposites with polymers to alter the charge of the PFR shell. The Fe 3O 4 NPs were used as the core and coated with green-luminescent PFR nanoshells by a simple hydrothermal approach. The FRET probe consists of an Fe 3O 4 core, a green-luminescent phenol formaldehyde resin (PFR) shell, and Au nanoparticles (NPs) as FRET quenching agent on the surface of the PFR shell. A magnetic, sensitive, and selective fluorescence resonance energy transfer (FRET) probe for detection of thiols in living cells was designed and prepared. ![]()
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