Time-Resolved Electrochemical Impedance Spectroscopy of Stochastic Nanoparticle Collision: Short Time Fourier Transform versus Continuous Wavelet Transform.
Long Duong HaKi Jun KimSeong Jung KwonByoung-Yong ChangSeongpil HwangPublished in: Small (Weinheim an der Bergstrasse, Germany) (2023)
This work demonstrates the utilization of short-time Fourier transform (STFT), and continuous wavelet transform (CWT) electrochemical impedance spectroscopy (EIS) for time-resolved analysis of stochastic collision events of platinum nanoparticles (NPs) onto gold ultramicroelectrode (UME). The enhanced electrocatalytic activity is observed in both chronoamperometry (CA) and EIS. CA provides the impact moment and rough estimation of the size of NPs. The quantitative information such as charge transfer resistance (R ct ) relevant to the exchange current density of a single Pt NP is estimated from EIS. The CWT analysis of the phase angle parameter is better for NP collision detection in terms of time resolution compared to the STFT method.
Keyphrases
- high resolution
- label free
- dual energy
- single molecule
- gold nanoparticles
- molecularly imprinted
- ionic liquid
- computed tomography
- convolutional neural network
- solid state
- protein kinase
- reduced graphene oxide
- loop mediated isothermal amplification
- contrast enhanced
- healthcare
- positron emission tomography
- health information
- real time pcr
- magnetic resonance imaging
- social media