Enhanced nonlinear and thermo optical properties of laser synthesized surfactant-free Au-Pt bimetallic nanoparticles

The Water-Based Synthesis of Platinum Nanoparticles Using KrF Excimer Laser Ablation

“…HR-STEM investigations indicated the presence of fully metallic Pt-NPs with mainly spherical and spherical-like shapes using different RR values. Finally, the fully metallic nature of the NPs and the smaller mean size, i.e., 2.2 nm ± 1.2 nm, obtained in our study differ from that reported in [ 2 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 ].…”

“…R. Fathima et al obtained monometallic Pt-NPs and bimetallic Pt-NPs/Au by an Nd:YAG laser with the first harmonic. They found a small mean size value for monometallic Pt colloids of 18 nm, while this value was 15.5 nm for bimetallic material, determined using HRTEM microscopy [ 51 ]. Kohsakowski et al ablated Pt-NPs in water by the PLAL process using a 3 ps laser system, and the Pt-NPs already formed were then added onto the C support by colloidal deposition.…”

Dual functionality of surface plasmon resonance and barrier layer on the photosensing and optical nonlinearity of ZnO nanorod arrays

“…28,29 Noble metal NP-decorated wide-bandgap semiconductors exhibit strong third-order NLO effects, 28,30 which are appropriate for optical imaging, optical power limiting, all-optical switching, laser technology, pulse compression, mode locking, saturable Q switches, frequency conversion, and electro-optic device fabrications. [31][32][33][34][35][36] Zhang et al 28 fabricated Ag@ZnO core-shell nanostructures via liquid-phase laser ablation and investigated their femtosecond nonlinear optical properties for potential applications in ultrafast all-optical switching. The enhancement in the NLR index n 2 of the Ag@ZnO core-shell nanostructure can be explained by the large intrinsic nonlinearity of the composite material, coupling of dipole modes and local field enhancement of the Ag metal NPs.…”

“…The low optical limiting of about B8 mW indicated their possible application in photonic devices. 37 Fathima et al 34 synthesized ligand-free Au-Pt bimetallic NPs via laser irradiation of a colloidal mixture of Au and Pt NPs, which exhibited strong reverse saturable absorption (RSA) behavior, strong optical limiting efficiency and photoconversion characteristics. The nonlinear absorption and refraction characteristics were considerably enhanced in the Au-Pt bimetallic NPs compared to those of the corresponding monometallic NPs and the pristine colloidal mixture.…”

“…The thermo-optical properties were also investigated via the thermal lens method and tuned by controlling the content of Au and Pt in the bimetallic NPs. 34 The passivation of ZnO surface defects and its coupling to Au/Pt NPs SPR usually results in enhanced photocurrent, elevation in the ZnO UV emission yield and a concurrent diminishing of visible emission. 1,3 Baharigushchi et al 3 reported the effects of the Au, Pt and bimetallic AuPt nanocluster (2-3 nm in size) decoration of ZnO nanorods on their charge transport, photoluminescence and UV sensitivity.…”