Ex-Solved Metal Nanoparticle Oxide Gas Sensor for Stable Sensitivity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing gas sensors face issues with desorption and aggregation of metal nanoparticles due to weak binding forces, leading to fluctuating sensitivity and reproducibility, which deteriorates their reliability and durability.
Innovation Solution
A method involving mixing metal nanoparticle and oxide support precursors, followed by calcining and sintering to form a solid solution, then heat-treating in a reducing atmosphere to elute metal nanoparticles uniformly on the oxide supports using the 'ex-solution' phenomenon.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If physical mixing or external deposition process is used to manufacture gas sensor, then manufacturing simplicity is improved, but binding force between metal nanoparticles and oxide support deteriorates
Solution Approach 1:
The patent merges the metal nanoparticle precursor and oxide support precursor into a single composite precursor material. This composite precursor is then processed through calcination and sintering to form a solid solution, from which metal nanoparticles are in-situ formed on the oxide support. This merging approach ensures strong binding between metal nanoparticles and oxide support while maintaining manufacturing feasibility through a standardized ceramic processing workflow.
Solution Approach 2:
The patent introduces a solid solution as an intermediary phase between the precursors and the final metal nanoparticle-oxide support structure. The solid solution formed during calcination and sintering serves as a mediator that facilitates uniform distribution and strong bonding of metal nanoparticles to the oxide support during the reducing atmosphere heat treatment process.
2Device complexity
If physical mixing method is used to produce sensing material, then manufacturing complexity is reduced, but uniformity and dispersibility of metal nanoparticles deteriorates
Solution Approach 1:
The patent combines metal nanoparticle precursor and oxide support precursor into a homogeneous composite precursor mixture before processing. This merging at the precursor stage ensures uniform distribution of metal species throughout the oxide support matrix, which is then preserved through the calcination and sintering processes to form a uniform solid solution and subsequent metal nanoparticle distribution.
Solution Approach 2:
The patent utilizes parameter changes during thermal processing to achieve uniform nanoparticle distribution. By controlling calcination temperature and sintering conditions, the precursors transform into a solid solution with uniform composition. The subsequent reducing atmosphere heat treatment then uniformly reduces metal species to nanoparticles throughout the oxide support structure.
3Ease of manufacture
If weak binding force structure is used in gas sensor, then manufacturing ease is improved, but durability and reliability of sensor deteriorates
Solution Approach 1:
The patent merges metal and oxide precursors into a composite precursor that forms a strongly bound solid solution during processing. This merged structure ensures that metal nanoparticles remain firmly attached to the oxide support during sensing operations, preventing desorption and aggregation while maintaining manufacturing simplicity through a single integrated processing workflow.
Solution Approach 2:
The patent creates a composite material structure where metal nanoparticles are embedded within a strongly bound oxide support matrix. The composite precursor approach ensures intimate mixing and strong bonding at the nanoscale, resulting in a durable sensing material that maintains structural integrity during repeated thermal cycling and gas exposure.
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
The resulting metal nanoparticle-oxide support complex structure achieves improved durability, uniformity, and dispersibility, resulting in high gas sensitivity and selectivity with stable performance over time.
Implementation Method 1
heat-treating the solid solution of the step 2 in a reducing atmosphere to elute metal nanoparticles uniformly on the oxide supports using the ex-solution phenomenon
Implementation Method 2
preparing a solid solution by calcining and sintering the mixture of the step 1
Implementation Method 3
preparing a solid solution by calcining and sintering the mixture of the step 1
Data Source
AI summary
Provided is a method of producing a metal nanoparticle-oxide support complex structure, in which metal nanoparticles uniform in size are evenly distributed on the surface of oxide supports. A gas sensor with improved gas sensing ability and durability may be provided by using the same.