Label-Free Imaging of Catalytic H2O2 Decomposition on Single Colloidal Pt Nanoparticles Using Nanofluidic Scattering Microscopy

• DOI: 10.1021/acsnano.3c03977
• Publication Date: 2023-10-17T15:50:57Z
• Authors: Björn Altenburger; Carl Andersson; Sune Levin; Fredrik Westerlund; Joachim Fritzsche; Christoph Langhammer
• Keywords: Plasmonic Nanoparticles

Single-particle catalysis aims at determining factors that dictate the nanoparticle activity and selectivity. Existing methods often use fluorescent model reactions low reactant concentrations, operate pressures, or rely on plasmonic enhancement effects. Hence, to measure single-nanoparticle under technically relevant conditions without fluorescence other mechanisms are still lacking. Here, we introduce nanofluidic scattering microscopy of catalytic single colloidal nanoparticles trapped inside channels fill this gap. By detecting minuscule refractive index changes in a liquid flushed trough nanochannel, demonstrate local H2O2 concentration water can be accurately measured. Applying principle, analyze profiles adjacent Pt during decomposition into O2 H2O derive particles' individual turnover frequencies from growth rate gas bubbles formed their respective nanochannel reaction.