The size control of silver nanocrystals with different polyols and its application to low-reflection coating materials

Abstract

The size of silver nanocrystals in polyol synthesis can be simply controlled by tuning the viscosity of the reaction medium such as ethylene glycol, 1,2-propanediol, 1,4-butanediol and 1,5-pentanediol. We found that a higher viscose medium (1,5-pentanediol) led to monodispersed smaller particles thanks to the slow addition of silver atoms into the nuclei. Size-controlled silver nanocrystals of 30 nm were obtained in a viscosity controlled medium of 1,5-pentanediol to synthesize a low refractive index filler by coating with silica and subsequent etching of the silver core. The coated low-reflection layer from the hollow silica nanoparticles on polyethylene terephthalate (PET) film can greatly reduce the reflection of the PET film from 10% to 2% over the entire visible region.

Enhanced performance of layer-evolved bulk-heterojunction solar cells with Ag nanoparticles by sequential deposition

“…Concretely, silver nitrate (AgNO 3 ) is used as a precursor of silver, and poly-(vinylpyrrolidone) (PVP) (Molecular weight = 55,000) is used as a surfactant for a salt of Ag. Ag atoms are obtained by reducing AgNO 3 with 1,2-propanediol in the existence of deionized water, through the following reactions [33][34][35][36][37]: of over 2 wt%, the J SC value is reduced with that of the optimized ratio of Ag NPs in LE-BHJ device, and a similar V OC with a slightly increased FF obtained as summarized in Table 2. The LE-BHJ with Ag NPs exhibited slight lower FF value than the plain BHJ devices due to the possibility of different PC 71 BM concentration and interfaces with concentration gradient within the active layer during the sequential processing of top (acceptor) layer penetration to the pre-deposited bottom (donor) layer [19,21,38].…”

Dispersion control of Ag nanoparticles in bulk-heterojunction for efficient organic photovoltaic devices

“…PVP and OA are widely used as capping agents, and enable various metal NPs to disperse in solutions [11,[14][15][16]. These materials can passivate the surface of Ag NPs, and stabilize NPs, owing to the coordination of N atoms with Ag atoms at the surface of Ag NPs [17][18][19][20][21].…”

“…The procedure was developed by a previous report [11], which was followed. The size and morphology of the synthesized Ag NPs were obtained by field emission scanning electron microscopy (SEM, FEI-Sirion) with an accelerating voltage of 10-15 kV, as shown in Fig.…”

Fluorescent polyelectrolyte capped silver nanoclusters: Optimization and spectroscopic evaluation

“…This can be ascribed to the presence of larger non-fluorescent Ag nanoparticles in the sample prepared with 2:1 or smaller ratio, which shows a typical plasmonic peak around 440 nm [4]. In most conventional colloid synthesis, excess amount of stabilizing or capping agent is typically used to get smaller size particles [16-18]. However, according to the protocol used by Shang and Dong, in order to get smaller clusters, the molar amount of polymer used must be less than the molar amount of silver.…”