Glow Discharge Plasma Oxygen Mixture for Organic Sample Analysis
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Solution Overview
Problem
Current glow discharge spectrometry methods face challenges in analyzing organic and polymer samples due to low etching speed, poor etching uniformity, and interference from chemical species, which limits depth resolution and signal quality.
Innovation Solution
Modifying the oxygen concentration in the gaseous mixture during exposure to the glow discharge plasma and applying a radiofrequency electric field with an axial or transverse magnetic field, along with calibration using a known organic sample, to enhance etching speed and signal intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a pure argon plasma is used for glow discharge spectrometry, then the etching speed is maximized and the plasma efficiently erodes the sample surface, but certain elements such as fluorine and non-metallic elements are not effectively excited
Solution Approach 1:
The patent changes the chemical composition parameter of the plasma gas from pure argon to an argon-oxygen mixture, where oxygen concentration is optimized at 1-10%. This parameter modification enables effective excitation of fluorine and non-metallic elements while preserving adequate etching performance for the analyzed samples
Solution Approach 2:
The patent uses a composite gas mixture of argon and oxygen instead of a single pure gas. This composite approach combines the benefits of argon (adequate etching capability) with oxygen (enhanced excitation of specific elements), creating a plasma environment that addresses multiple analytical requirements simultaneously
2Reliability
If a neon or helium plasma is used to increase the ionic or atomic emission lines of certain elements, then the atomic emission of fluorine is increased, but the etching speed decreases significantly
Solution Approach 1:
Instead of switching to neon or helium gases, the patent modifies the argon plasma composition by adding oxygen at controlled concentrations (1-10%). This parameter change achieves enhanced atomic emission for elements like fluorine while maintaining the high etching speed characteristic of argon-based plasmas, avoiding the significant speed penalty associated with neon or helium
3Reliability
If a mixture of argon and helium is used to increase the intensity of certain atomic emission lines, then the ionization efficiency is increased, but the etching speed does not reach the maximum obtained with pure argon plasma
Solution Approach 1:
The patent changes the gas mixture composition from argon-helium to argon-oxygen, where oxygen concentration is optimized at 1-10%. This parameter modification achieves enhanced ionization efficiency and atomic emission intensity while preserving the maximum etching speed that can be obtained with argon-based plasmas, overcoming the limitation of argon-helium mixtures
4Reliability
If hydrogen is added to argon plasma to increase ionization yields, then the ionization efficiency is improved, but hydrogen species induce emission bands that interfere with atomic or ionized element lines and significantly alter quantitative analysis
Solution Approach 1:
The patent changes the gas composition parameter by replacing hydrogen addition with oxygen addition (1-10% in argon). This parameter modification achieves improved ionization yields and enhanced atomic emission without introducing the spectral interference problems caused by hydrogen species, maintaining clean spectral lines for quantitative analysis
5Productivity
If oxygen is present in the glow discharge spectrometer as an impurity, then parasitic spectral lines are generated, but intentional addition of gaseous oxygen at controlled concentrations increases etching speed and improves signal intensity for organic samples
Solution Approach 1:
The patent changes the gas composition parameter by intentionally adding oxygen at controlled concentrations (1-10%) to the argon plasma. This parameter modification achieves significantly improved etching speed and signal intensity for organic samples while maintaining spectral quality through proper concentration control, transforming oxygen from a problematic impurity into a beneficial additive
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly increases etching speed, improves etching uniformity, and enhances the signal-to-noise ratio, enabling precise analysis of organic and polymer samples with better depth resolution.
Implementation Method 1
a sample to be analyzed is exposed to an etching plasma which performs surface ablation
Implementation Method 2
Glow discharge spectrometry is a technique for the elementary and/or molecular analysis of solids
Implementation Method 3
the plasma ensures, via various physico-chemical mechanisms, the excitation and the ionization of the eroded species
Implementation Method 4
the plasma ensures, via various physico-chemical mechanisms, the excitation and the ionization of the eroded species
Implementation Method 5
The monitoring of the species present in the plasma, respectively by an optical spectrometer for the excited species
Implementation Method 6
by a mass spectrometer for the ionized species thus makes it possible to measure the elementary chemical composition
Implementation Method 7
applying a radiofrequency electric field with an axial or transverse magnetic field
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
The method involves placing a solid sample (3) in a luminescent discharge lamp (2), and injecting gas mixture with rare gas and gaseous oxygen in the lamp. A pulsated radio frequency type electric discharge is applied to electrodes of the lamp to generate luminescent discharge plasma. An organic material layer is exposed to the plasma to obtain imaging speed of the layer greater than imaging speed produced by the plasma in the rare gas without oxygen. A signal representative of ionized and/or excited species of the plasma is measured by a spectrometer (4) e.g. optical emission spectrometer. The inert gas is argon, neon, helium or mixture of the inert gas.