Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Sodium gold sulfite gold water as well as synthesis method and application thereof

A technology of gold sodium sulfite gold water and a synthesis method, which is applied to semiconductor devices, process efficiency improvement, circuits and other directions, can solve problems such as instability and color of gold sodium sulfite gold water, and achieves overcoming the influence of impurities and achieving good stability. Effect

Active Publication Date: 2022-03-11
深圳市联合蓝海应用材料科技股份有限公司
View PDF7 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a kind of sodium gold sulfite gold water and its synthesis method and application in order to overcome the existing cyanide-free gold plating solution, such as the unstable and colored problem of sodium gold sulfite gold water

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Sodium gold sulfite gold water as well as synthesis method and application thereof
  • Sodium gold sulfite gold water as well as synthesis method and application thereof
  • Sodium gold sulfite gold water as well as synthesis method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0021] The first aspect of the present invention provides a kind of synthetic method of sodium gold sulfite gold water, wherein, this synthetic method comprises:

[0022] Precipitating the chloroauric acid solution and ammonia water to obtain a bright orange-yellow precipitate product; wherein the concentration of ammonia water is 10-15 wt%, and the terminal pH of the precipitate product is 7.2-8.5;

[0023] The precipitated product is washed and filtered to obtain a gold fulminate precipitate;

[0024] A slurry prepared by mixing the gold fulminate precipitate with water, then performing an initial reaction with sulfite on the slurry, and then adjusting the final pH of the obtained reaction product to be greater than 10 and not greater than 11 to obtain an alkaline product;

[0025] The alkaline product is reacted again to obtain a gold plating solution free of trivalent gold ions.

[0026] The synthesis method provided by the present invention improves the conditions for pr...

Embodiment 1

[0052] Gold dissolution: Put 20g of gold flakes into a beaker, add aqua regia and heat until all the gold is dissolved;

[0053] Nitrate removal with hydrochloric acid: Concentrate the gold solution, and add concentrated hydrochloric acid dropwise until no yellow nitrogen oxides escape. After the removal of nitrification, dilute with pure water to 200mL to obtain a chloroauric acid solution with a concentration of 100g / L;

[0054] Ammonia precipitation: dilute concentrated ammonia with pure water (the concentration of ammonia water is 12.5wt%) and then add it to the chloroauric acid solution for precipitation reaction. The temperature of the precipitation reaction is 60°C. The precipitation is gradually formed and the stirring is continued until the final pH value of the precipitated product was 7.9, and a bright orange-yellow precipitated product (such as Figure 1a shown);

[0055] Cleaning and filtering: transfer the precipitated product to a Buchner funnel, stir and wash t...

Embodiment 2

[0059] Gold dissolution: Put 20g of gold flakes into a beaker, add aqua regia and heat until all the gold is dissolved;

[0060] Nitrate removal with hydrochloric acid: Concentrate the gold solution to 100 g / L, and add concentrated hydrochloric acid dropwise until no yellow nitrogen oxides escape. After the removal of nitric acid, dilute to 200 mL with pure water to obtain a chloroauric acid solution with a concentration of 100 g / L;

[0061] Ammonia precipitation: Dilute concentrated ammonia water with pure water (the concentration of ammonia water is 14wt%) and then add it to the chloroauric acid solution for precipitation reaction. The temperature of the precipitation reaction is 55° C., and the precipitation is gradually generated and the stirring is continued until the final pH value of the precipitated product is 8.1, a bright orange-yellow precipitated product (with Figure 1a Similar results, not shown);

[0062] Cleaning and filtering: transfer the precipitated product t...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to the field of cyanide-free gold plating liquid, and discloses sodium gold sulfite gold water as well as a synthesis method and application thereof. The preparation method comprises the following steps: carrying out precipitation reaction on a chloroauric acid solution and ammonia water to obtain a bright orange-yellow precipitation product; wherein the concentration of the ammonia water is 10-15 wt%, and the final pH value of the precipitation product is 7.2-8.5; cleaning and filtering the precipitation product to obtain a gold raphanate precipitate; mixing the gold raphanate precipitate with water to prepare a slurry, then carrying out an initial reaction on the slurry and sulfite, and then adjusting the final pH value of the obtained reaction product to be greater than 10 and not greater than 11 to obtain an alkaline product; and the alkaline product is subjected to a re-reaction, and the gold plating solution without the trivalent gold complex is obtained. Colorless and not only transparent cyanide-free gold plating liquid, namely colorless transparent gold sodium sulfite gold water, is obtained, the stability is good, and the influence of impurities is overcome. The method can be applied to the processing of wafers and chips, in particular to the application of wafer electrogilding.

Description

technical field [0001] The invention relates to the field of preparation of cyanide-free gold plating solution, in particular to sodium gold sulfite gold water and its synthesis method and application. Background technique [0002] Gold has been widely used in integrated circuits due to its high temperature resistance, anti-tarnish resistance and extremely high resistance to chemical corrosion. Among them, environmentally safe and cyanide-free gold plating is currently a major demand for wafer gold plating. Although, with the encouragement of the national policy on the cyanide-free gold plating industry, the technology of the industry has been greatly developed in recent years, but in order to meet the performance of wafer processing and chips, it is still necessary to improve the stability of the gold plating solution and overcome the simple quality caused by poor technology. Effect of gold impurities. [0003] The color of ammonia-type sodium gold sulfite plating solutio...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C25D3/48C25D7/12
CPCC25D3/48C25D7/12Y02P10/20
Inventor 邓川王彤任长友曾智聪
Owner 深圳市联合蓝海应用材料科技股份有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com