Broadband absorption and enhanced photothermal conversion property of octopod-like Ag@Ag2S core@shell structures with gradually varying shell thickness

Abstract

Photothermal conversion materials have promising applications in many fields and therefore they have attracted tremendous attention. However, the multi-functionalization of a single nanostructure to meet the requirements of multiple photothermal applications is still a challenge. The difficulty is that most nanostructures have specific absoprtion band and are not flexible to different demands. In the current work, we reported the synthesis and multi-band photothermal conversion of Ag@Ag2S core@shell structures with gradually varying shell thickness. We synthesized the core@shell structures through the sulfidation of Ag nanocubes by taking the advantage of their spatially different reactivity. The resulting core@shell structures show an octopod-like mopgorlogy with a Ag2S bulge sitting at each corner of the Ag nanocubes. The thickness of the Ag2S shell gradually increases from the central surface towards the corners of the structure. The synthesized core@shell structures show a broad band absorption spectrum from 300 to 1100 nm. Enhanced photothermal conversion effect is observed under the illuminations of 635, 808, and 1064 nm lasers. The results indicate that the octopod-like Ag@Ag2S core@shell structures have characteristics of multi-band photothermal conversion. The current work might provide a guidance for the design and synthesis of multifunctional photothermal conversion materials.

Coffee-based colloids for direct solar absorption

“…In recent years, the so-called nanocolloids (also known as nanofluids 6 , 7 ), namely stable suspensions of nanoparticles in a base fluid, have attracted great attention for their use in direct solar absorption. These fluids are characterised by a suspended phase with the ability to confer specifically-enhanced photo-thermal properties to the base fluid 8 – 10 ; thus, if opportunely designed, nanocolloids are expected to have a promising potential in solar-to-thermal energy conversion 11 – 13 .…”

Magnetic resonance imaging and photothermal conversion properties of Gd‐C nanocomposites for interstitial lymphography

“…The experimental setup and detailed procedure can be referred to our previous reports (Jiang et al, ). Briefly, 1 mL suspension containing Gd‐C nanocomposites was filled in a quartz cuvette (4 × 1 × 1 cm).…”

Investigation on influence of antimony tin oxide/silver nanofluid on direct absorption parabolic solar collector

“…UV-Vis spectrophotometer (SHIMADZU) with a spectral range of 280nm-1200nm is used for the optical characterization of the nanofluids. The wavelength range is sufficient in analyzing the optical absorptivity of broad-band spectral absorbing nanofluids as the complete extinction of radiation takes place in this spectral range [13,31]. The analysis is done in the wavelength corresponding to the solar spectrum ranging from visible to NIR range (280-1200 m).…”

“…Yu et al [12] synthesized CuO/Ag composite nanoparticle for solar direct absorption application. Jiang et al [13] synthesized Ag-Ag2S core-shell structure with broad absorption spectra which exhibited an absorption peak in the wavelength range of 300 nm-1100 nm. Zeng et al [14] synthesized Sn/SiO2/Ag core-shell PCM nanoparticle for thermal energy storage and solar absorption.…”