Related Experiment Video
Updated: Jan 29, 2026

The Evolution of Silica Nanoparticle-polyester Coatings on Surfaces Exposed to Sunlight
Published on: October 11, 2016
Electrochemiluminescence observing the surface features of Ru-doped silica nanoparticles based on
Xiaoqin Lv1, Min Li1, Zhihui Guo1
1Key Laboratory of Analytical Chemistry for Life Science of Shaanxi Province, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an, China.
Abstract:
We present an innovative and sensitive electrogenerated chemiluminescence (ECL) strategy for observing the surface feature of a single silica nanoparticle based on its collision with an ultramicroelectrode (UME). As an ECL luminophore, Ru(bpy)3 2+ molecules are doped into silica nanoparticles. The stochastic collision events of Ru(bpy)3 2+ -doped silica nanoparticles (RuSNPs) can be tracked by observing the ECL 'blips' from the ECL reaction of Ru(bpy)3 2+ with a coreactant in solution. When RuSNPs collided with UME, Ru(bpy)3 2+ molecules that only exist near the collision site of silica nanoparticles (NPs) were electrochemically oxidized to form Ru(bpy)3 3+ , and then emitted light, because silica NPs are insulated. The inhomogeneous properties of silica nanoparticle surfaces will produce diverse ECL blips in intensity and shape. In addition, distribution gradients from the he Ru(bpy)3 2+ in a silica matrix also affect ECL blips. Some information on the surface properties of silica NPs can be obtained by observation of single silica collision events.
Related Concept Videos
Types Of Collisions - I
Types of Collisions - II
Basic Postulates of Kinetic Molecular Theory: Particle Size, Energy, and Collision
Elastic Collisions: Introduction
Elastic Collisions: Case Study
Collisions in Multiple Dimensions: Introduction

