Synergistic Effect Induced High Photothermal Performance of Au Nanorod@Cu₇S₄ Yolk–Shell Nanooctahedron Particles

Abstract

Au nanorod (NR) which has strong LSPR (longitudinal surface plasmon resonance) effect in near-infrared (NIR) region was introduced into the Cu 7 S 4 hollow NPs to form Au NR@Cu 7 S 4 yolk−shell structured nanoparticles (YSNPs) for improving the photothermal property of NPs. The optimum photothermal conversion efficiency of the as-prepared YSNPs is 68.6%. The hybrid YSNPs had the highest photothermal property compared with the equivalent used Au NR and pure Cu 7 S 4 because of the synergistic effect of metal and semiconductor. In this case, the synergistic effect in YSNPs was discussed by tuning sizes of the YSNPs and the thickness of Cu 7 S 4 shell. The experimental results demonstrated that the NIR photoabsorption and the photothermal conversion performance of Au NR@Cu 7 S 4 YSNPs were much dependent on the geometric change of YSNPs, since the electrical field interaction between inner Au NR core and outer Cu 7 S 4 shell is closely effected by the distance of two materials and thickness of out-shell, as confirmed by the 3D finitedifference time domain simulation (FDTD) theory simulation. Moreover, we proved that the hollow yolk−shell structure of the YSNPs also endowed the NPs with a large potential in drug delivery.

Recent advances in the rational design of copper chalcogenide to enhance the photothermal conversion efficiency for the photothermal ablation of cancer cells

“…In the Kirkendall effect method 66 the template, such as Cu 2 O, reacts with the new molecular or ionic species (S, Se, Te precursor) by atomic or ionic diffusion and then a new shape and composition is formed. Using Au@Cu 2 O as a hard template, Yu et al 49 and Zhang et al 67 have developed two different Au@Cu 2Àx S yolkshell nanostructures (Fig. 1B).…”

“…46 Specially, the absorption of copper chalcogenide is more dependent on their size, morphology and phase. 47 In the past few years, several methods, such as hydrothermal method and solvothermal method, 48 thermal decomposition method 19 and hard template method, 49 have been developed to control size, morphology and phase of copper chalcogenide. And we will introduce how to use the three main synthesis approaches for copper chalcogenide in this section.…”

“…Therefore, it is a good way to design copper chalcogenide hybrid nanostructures with enhanced LSPRs absorption and higher PTCE by utilizing surface plasmon resonance enhancement phenomena. And latterly, several hybrid nanostructures for copper and gold NPs 49,67 were designed and synthesized to demonstrate that the PTCE of the hybrid nanostructures can be apparently enhanced by increased LSPRs absorption, due to the coupling effect of LSPRs caused by the collective oscillations of the electron or hole in the Au and Cu 2Àx S NPs. Based on the coupling effect of LSPRs in the hybrid nanostructures and full utilization of light energy by the yolk-shell structure which greatly improves the multiple refractions of light between cores and shells within the interior voids, Zhang et al 67 has uncovered the unique Au@Cu 7 S 4 yolk-shell structure by an inward replacement strategy according to the Kirkendall effect.…”

“…As expected, the nanomaterials possessed a powerful photothermal performance with 63% PTCE under the irradiation of 980 nm light and power density of 0.51 W cm À2 . Subsequently, Yu et al 49 have further investigated the geometric factors of the hybrid nanostructures acting on their LSPRs absorption and photothermal conversion behavior by using the Au nanorod@Cu 2Àx S yolk-shell. They regarded that the thinner shell and smaller inner void showed a stronger surface plasmon resonance absorption and a higher PTCE (Fig.…”

Plasmonic doped semiconductor nanocrystals: Properties, fabrication, applications and perspectives

“…; copyright 2016 American Chemical Society.Drug delivery systems are receiving increasing attention in the field of cancer therapy, with the possibility of remote and noninvasive control over drug release for improved treatment efficacy and reduced side effects. Promising results were reported by loading nanoparticles, such as gold nanorod and hollow Cu 7 S 4 yolk-shell NCs, with specific drugs [336]. Thermosensitive drug delivery systems were also developed, which exploit the photothermal properties of the NIR plasmonic copper chalcogenide NCs leading to the photothermal release of the pre-loaded drugs.…”