Silicon-Coated Ion Source for Hydrogen-Stable GC/MS Spectra

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Solution Overview

Problem

Distortion of chromatographic peaks and mass spectra occurs when hydrogen is used as a carrier gas or cleaning agent in gas chromatograph/mass spectrometers, leading to incorrect analyte identification due to unwanted interactions with hydrogen and materials in the ionization source, particularly affecting compounds with functional groups or chemical bonds that can be reduced by hydrogen.

Innovation Solution

An ion source with components partially coated with a silicon or silicon hydride layer to minimize interactions between analytes and hydrogen, improving spectral fidelity and reducing chromatographic peak tailing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If hydrogen is used as carrier gas or cleaning agent in GC/MS, then productivity and sensitivity are improved, but spectral fidelity deteriorates and chromatographic peak tailing occurs due to unwanted interactions with analytes

Engineering Contradiction:

Improveanalytical throughput and sensitivityVSAvoidspectral fidelity

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

A silicon-based coating layer is introduced as an intermediary between the metal ion source components and the analyte molecules. This coating layer acts as a protective barrier that prevents hydrogen from interacting directly with the analytes, thereby eliminating the harmful hydrogenation reactions while allowing hydrogen to continue being used as carrier gas for its productivity and sensitivity benefits

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The silicon-based coating creates an inert environment on the surface of ion source components, preventing hydrogen from accessing and reacting with analyte molecules. This inert barrier allows the system to maintain the advantages of hydrogen carrier gas without suffering from the harmful chemical interactions that cause spectral distortion and peak tailing

Inventive Principle:

Principle #39Inert atmosphere (Inert environment)

2Device complexity

If traditional metal ion source components are used with hydrogen carrier gas, then device complexity is minimized, but harmful interactions occur causing spectral distortion and peak tailing

Engineering Contradiction:

Improveion source structureVSAvoidhydrogenation of analytes

Core Design Contradiction:

Device complexityVSObject-affected harmful factors

Solution Approach 1:

The ion source components are transformed from pure metal materials to composite structures with silicon-based coating layers. This composite approach combines the structural advantages of metal with the chemical inertness of silicon, creating a surface that resists hydrogenation reactions while maintaining the mechanical and electrical properties needed for ion source functionality

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The silicon-based coating is applied specifically to the internal surfaces of ion source components that come into contact with analytes and hydrogen, such as the ionization chamber, drawout cylinder, and lens surfaces. This localized treatment provides protection exactly where needed without requiring complete redesign of the entire device

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS20250308875A1Ion source

Publication Date: 2025.10.02 AGILENT TECHNOLOGIES INC

AI summary

Provided herein is an ion source containing a plurality of components, at least one of which is partially coated with a layer of silicon. The ion source reduces reactivity between the sample and the carrier gas, reduces or eliminates tailing in ion chromatograms, and/or improves mass spectral fidelity. Also provided are methods of using the ion source in a mass spectrometer or gas chromatograph-mass spectrometer.