Insertable, Scabbarded, and Nanoetched Silver Needle Sensor for Hazardous Element Depth Profiling by Laser-Induced...

Area of Science:

• Analytical Chemistry
• Materials Science
• Environmental Science

Background:

• Hazardous heavy metal contamination poses significant risks to public health and the environment.
• Laser-induced breakdown spectroscopy (LIBS) is a powerful tool for elemental analysis but struggles with complex sample matrices.
• Direct analysis of loose, water-containing, or bulk samples using LIBS is challenging, limiting its application in areas like food safety and environmental monitoring.

Purpose of the Study:

• To develop a novel sensor for rapid hazardous heavy metal sensing and depth profiling.
• To overcome the limitations of traditional LIBS analysis for challenging sample types.
• To enable accurate elemental depth profiling in bulk samples.

Main Methods:

• Development of an insertable, scabbarded, and nanoetched silver (NE-Ag) needle sensor.
• Utilizing a micro-nanostructure surface for analyte absorption and a stainless-steel scabbard for protection.
• Application of the sensor for Laser-induced breakdown spectroscopy (LIBS) analysis of hazardous elements.

Main Results:

• The NE-Ag needle sensor demonstrated high sensitivity for cadmium (Cd) detection with a limit of detection of 0.8 mg/L and a relative standard deviation of 6.7%.
• Excellent correlation (Pearson correlation coefficient ≥ 0.96) was achieved for Cd and chromium (Cr) depth profiling.
• The entire testing process, including sample preparation and analysis, could be completed in under 1 hour.

Conclusions:

• The insertable and scabbarded NE-Ag needle sensor is a promising tool for rapid hazardous heavy metal sensing and depth profiling.
• This innovative sensor overcomes key limitations of LIBS, enabling analysis of difficult sample matrices.
• The technology holds significant potential for applications in environmental monitoring, food safety, and industrial quality control.