Monovalent Alkali Cations: Simple and Eco-Friendly Stabilizers for Surfactant-Free Precious Metal Nanoparticle Colloids

Abstract

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Surfactant-Free Colloidal Strategies for Highly Dispersed and Active Supported IrO2 Catalysts: Synthesis and Performance Evaluation for the Oxygen Evolution Reaction

“…13,25 In addition, we have previously demonstrated the importance of OHas well as the corresponding cation for the stability of colloidal suspensions. 25,[31][32][33] As pointed out above, Ir NPs synthesized in EtOH are less stable and slightly flocculate after few days of storage, similar to previous reports on the synthesis of Pt NPs in MeOH and EtOH. 25 As already observed for Pt NPs, 25 the FTIR band corresponding to the CO stretching mode is significantly weaker in the case of EtOHbased colloidal dispersions (see Figure S5).…”

UV-induced syntheses of surfactant-free precious metal nanoparticles in alkaline methanol and ethanol

“…This can be attributed to the need for a suitable alcohol-Pt ratio in order to perform the reduction of the salt while the alcohol gets oxidized for the synthesis to proceed. 13,14 For 0% water the size is 1.4 AE 0.3 nm whereas for 50% water the size is 1.7 AE 0.3 nm, see Fig. 4c.…”

“…11 A recently reported wet chemical surfactant-free synthesis is suitable to obtain precious metal NPs with superior catalytic activity. [12][13][14] This was for instance demonstrated with Pt NPs for hydrogenation reaction and Ir NPs for the oxygen evolution reaction. 12,15 The synthesis is performed at low temperature (<80 C) and does not require harsh chemicals.…”

Solvent‐Dependent Growth and Stabilization Mechanisms of Surfactant‐Free Colloidal Pt Nanoparticles

“…the absence of any surfactants, low temperature, low pressure, no need for inert atmosphere etc., is indeed sensitivity to parameters that are usually 'disregarded' because they are not expected to strongly influence size or colloidal properties in state-of-the-art colloidal approaches using surfactants. [19] One of the most important parameters in colloidal syntheses is obviously the solvent. We investigate the influence of the solvent properties on the surfactant-free particle formation and stabilization.…”