Tin Oxide Coated Conductive Particles for Humidity Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Tin oxide electroconductive particles deteriorate in electroconductivity under severe environmental conditions such as high temperature and high humidity, which existing technologies do not address effectively.
Innovation Solution
The development of electroconductive particles with a core particle coated by a tin oxide layer of specific crystallite size (70 to 200 Å) that maintains electroconductivity, achieved through an ultrasonicated reaction system and firing in a weakly reducing atmosphere, ensuring high dispersibility and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional tin oxide particles are used, then electroconductivity is achieved, but electroconductivity deteriorates under high temperature and high humidity conditions
Solution Approach 1:
The invention changes the crystallite size parameter of tin oxide to a specific range (70-200 Å) to achieve stable electroconductivity. This parameter optimization resolves the contradiction by finding a critical size range that maintains electroconductivity under severe environmental conditions while still providing adequate conductivity.
Solution Approach 2:
The invention creates a composite structure with a core particle and a tin oxide-containing coating layer on the surface. This composite architecture protects the core while the controlled crystallite size tin oxide layer maintains electroconductivity, resolving the stability-conductivity contradiction.
2Object-generated harmful factors
If tin oxide coating layer is formed, then electroconductivity is provided, but electroconductivity deteriorates in severe environment
Solution Approach 1:
By optimizing the crystallite size parameter of tin oxide within 70-200 Å, the invention prevents electroconductivity deterioration. This specific size range creates a stable structure that resists environmental degradation while maintaining the electroconductive function of the coating layer.
Solution Approach 2:
The invention applies preliminary protective measures by controlling the crystallite size and forming a stable coating structure before environmental exposure. This preemptive optimization of the coating layer structure prevents deterioration from occurring in the first place under severe conditions.
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 electroconductive particles maintain electroconductivity even in severe environments, with improved dispersibility and stability, as evidenced by reduced surface resistivity and increased loadability in films, preventing deterioration under high temperature and high humidity conditions.
Implementation Method 1
The tin oxide of the coating layer has a crystallite size of 70 to 200 Å
Implementation Method 2
achieved through an ultrasonicated reaction system
Data Source
AI summary
An electroconductive particle having a core particle and a tin oxide-containing coating layer on the core particle. The tin oxide of the coating layer has a crystallite size of 70 to 200 Å. The electroconductive particle preferably has a ratio of R3 to R1 of 1 to 250, wherein R1 and R3 are respective surface resistivities of electroconductive films formed of a coating composition containing the electroconductive particle and prepared by 1-hour dispersing and 3-hour dispersing, respectively. The coating layer preferably comprises dopant element-free, electroconductive tin oxide.