# Preparation of Carbon Fiber Electrodes Modified with Silver Nanoparticles by Electroplating Method

## TL;DR

Researchers improved carbon fiber electrodes by modifying them with silver nanoparticles, resulting in better performance for measuring electric fields in ocean and geoelectric environments.

## Contribution

A novel electroplating method to modify carbon fiber electrodes with silver nanoparticles, enhancing their performance for electric field sensing.

## Key findings

- The AgNP-CF sensor shows low potential drift (52.1 µV/24 h) and high stability.
- The sensor has low self-noise (2.993 nV/√Hz@1 Hz) and minimal temperature drift (<70 µV/°C).
- The AgNP-CF electrode performs well in field and simulated ocean tests.

## Abstract

To solve the problems of carbon fiber (CF) electrodes, including poor frequency response and large potential drift, CFs were subjected to a roughening pretreatment process combining thermal oxidation and electrochemical anodic oxidation and then modified with Ag nanoparticles (AgNPs) using electroplating to prepare a CF electric field sensor. The surface morphology of the as-prepared AgNP-CF electric field sensor was characterized via optical microscopy, scanning electron microscopy, XPS, and energy-dispersive spectroscopy, and its impedance, polarization drift, self-noise, and temperature drift values were determined. Results show that the surface modification of the AgNP-CF electric field sensor is uniform, and its specific surface area is considerably increased. The electrode potential drift, characteristic impedance, self-noise, and temperature drift are 52.1 µV/24 h, 3.6 Ω, 2.993 nV/√Hz@1 Hz, and less than 70 µV/°C, respectively. Additionally, the AgNP-CF electric field sensor demonstrates low polarization and high stability. In field and simulated ocean tests, the AgNP-CF electrode exhibits excellent performance in the field and underwater environments, which renders it promising for the measurement of the ocean and geoelectric fields owing to its advantages, such as low noise and high stability.