Synthesis of gold-spikes decorated biomimetic silica microrod for photothermal agents

Photothermal Cellulose-Patch with Gold-Spiked Silica Microrods Based on Escherichia coli

“…Evaluation of the photothermal heating by AGE particles dispersed in water showed a high heating efficiency of 44.0%. 5 Namely, the heating efficiency of water was decreased, because the thermal energy of patch induced by the photothermal effect was transferred to the cuvette and water via conduction. Actually, in test of steam generation, T water was increased to 100 °C when NIR was illuminated directly to the patch dipped in the water.…”

“…Thus, using them as frameworks was an adequate strategy for easy modification. The cell culturing of E. coli followed the reported protocol, 5 and the silica layer was coated on the E. coli by a modified Stöber method. 19 Then, 10 mL of culturing solution containing E. coli was dispersed in 50 mL of 80 v/v % ethanol solution, followed by sequentially adding 1 mL of NH 4 OH and tetraethyl orthosilicate solution dropwise.…”

“…The resulting materials are herein referred to as armored golden E. coli (AGE) microrods. Although silica microrods decorated with AuNS showed good performance with higher conversion efficiency and stable activity during multiple reactions under NIR irradiation, 5 they should be dispersed in solution phase, before use as the photothermal agent. To extend the application area, freestanding cellulose-patch was prepared by mixing and drying of mixture of filter-paper pulp distributed in water, with AGE microrods.…”

“…Because the conventional approach in the chemical reaction and thermotherapy could not localize heat in the target region, the heat dissipation into the surrounding system in the chemical reaction and in thermotherapy induced low energy efficiency and damage to surrounding tissues and cellular components, respectively. In contrast, localized heating at the nanoscale region in solution or inner cell achieved using localized surface plasmon resonance (LSPR) of metallic nanoparticles (NPs), such as Au, Ag, and Cu, − could enhance the energy efficiency in the chemical reaction and minimize the unintended damage to nearby cells. Therefore, LSPR-mediated photothermal heating under near-infrared (NIR) irradiation is used as an emerging key technology in the field of photothermal therapy (PTT), − and chemical reactions. , …”

Silver, Gold, and Silver-Gold Bimetallic Nanoparticle-Decorated Dextran: Facile Synthesis and Versatile Tunability on the Antimicrobial Activity

“…In general, the naked noble metal-based NPs are usually not stable in solution. Their surface is usually decorated by substrates such as graphene oxide [19], carbon [20], silica [21], carbon nitride [14], or capped by organic molecules in order to stabilize them [22]. Among various capping and stabilizing agents, the dextran plays a promising role for development of noble metal NP-based novelty materials because they are not only biodegradable, environmental benignity, highly abundant, and low-cost [23] but also has better biocompatibility, lower toxicity, and slower degradation in the human body in comparison with other polysaccharides [24].…”