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Tetramethylammonium Hydroxide CAS 75-59-2 TMAH

Factory Supply Tetramethylammonium Hydroxide TMAH CAS 75-59-2 with Best Price

  • Appearance: Colorless to yellow liquid
  • Purity: 99. 0%min
  • Stock: In stock
  • Sample: Available
  • Zhishang Chemical: Tetramethylammonium Hydroxide Supplier & Manufacturer

Basic Info

What is Tetramethylammonium Hydroxide?

Tetramethylammonium hydroxide (TMAH) is an anemic crystal (frequently containing tertiary as well as pentagonal crystal water), with an amine-like smell, a melting point of 68-71 ° C, quickly soluble in water, exothermic when dissolved, as well as a solid liquid option. Alkaline and creamy. It is very easy to soak up moisture and can rapidly absorb carbon dioxide in the air. It decomposes into methanol and trimethylamine at 130 ° C. It is usually made use of with 10% or 25% water (or alcohol) solutions as well as substances having crystal water.

Tetramethylammonium hydroxide can swiftly absorb co2 in the air. Its vapor stress is low at room temperature, and also it can be totally broken down as well as gasified at 135 ~ 145 ° C. The high-purity product has no trace residue also when it is refined at a reduced temperature level of 140 ° C. Ammonium hydroxide decays right into trimethylamine and dimethyl ether at 135-140 ° C, as well as normally makes 10% and 25% aqueous options.

It is strongly alkaline and secure at temperature levels not surpassing its decay factor. When the disintegration point is surpassed, it quickly disintegrates right into trimethylamine as well as methanol. When the catalysis is completed, it is easy to get rid of without leaving any kind of deposit. No contamination to silicone products. Therefore, it is additionally called “temporary catalyst”. Tetramethylammonium hydroxide has a particular ammonia smell as well as is highly alkaline. In regards to silicone, it is made use of as dimethyl silicone oil, benzyl silicone oil, silicone diffusion pump oil, solvent-free silicone molding compound, silicone material silicone Driver for rubber etc. In the production of natural silicon wafers, it is frequently utilized as a brightener, cleaning representative as well as get in touch with etching agent for computer system silicon wafers.

Tetramethylammonium Hydroxide Uses

  1. As a developer in the integrated circuit (IC) industry, liquid crystal display industry (TFT-LCD), and optoelectronics (LED) industry.

    TMAH is an organic base. On the one hand, it has the same strong alkalinity as the inorganic base. On the other hand, it has its unique characteristics, that is, it will not leave metal ions during use, and it can be decomposed into trimethylamine gas and Methanol gas without leaving any traces, can be widely used in modern electronics industry. The main component of the developer is alkali. The original alkali used was inorganic alkali KOH. With the advancement of science and technology, the design and manufacture of integrated circuits need to meet various complex process conditions, and the requirements for chemical impurities are becoming more and more stringent. The developer used before is an inorganic alkali such as KOH. After developing, a large amount of water needs to be used to rinse the substrate. In the end, it cannot be guaranteed that K+ can be completely rinsed. Excessive residues of metal ions cannot meet some harsh process conditions. For example, the number of electronic components in a single manufacturing unit is increasing, and the line width is becoming narrower and narrower, which has become a bottleneck that cannot be ignored restricting the development of the electronics industry. TMAH It just overcomes the shortcomings of KOH, no metal ions, and no residue after pyrolysis.

    Therefore, TMAH is currently the most commonly used developer with the best performance. It has replaced inorganic alkalis (KOH, NAOH) and is widely used in the integrated circuit (IC) industry, liquid crystal display industry (TFT-LCD), and optoelectronics industry.

  2. Cleaning agent: TMAH has a good cleaning effect and no residue as a cleaning agent in the electronic industry such as PCB.
  3. Industrial catalysts (phase-transfer catalysts, which can help reactants transfer from one phase to another phase that can react, thereby speeding up the reaction rate of heterogeneous systems. Generally, there are phase-transfer catalyzed reactions, and there are Aqueous solution and organic solvent are two-phase, ionic reactant is often soluble in water phase, insoluble in organic phase, and organic substrate is soluble in organic solvent. When there is no phase transfer catalyst, the two phases are separated from each other, several The reactants cannot be contacted, and the reaction proceeds very slowly. The existence of the phase transfer catalyst can combine with the ions in the water phase, and use its own affinity to the organic solvent to transfer the reactants in the water phase to the organic phase , prompting the reaction to occur).

    As a quaternary ammonium base, TMAH is an efficient catalyst in the field of organic silicon and rubber antioxidants.

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Application Fields of Tetramethylammonium Hydroxide

  • Surfactant: Since TMAH is a quaternary ammonium base, it can be used as a surfactant.
  • Organic synthesis reagent: TMAH is an organic base, which can react with various acids to prepare corresponding ammonium salts, such as tetramethylammonium bicarbonate, tetramethylammonium fluoride, etc., which are difficult to synthesize and have no commercially available ammonium Salt; preparation of acidic compound alkyl derivatives, etc.
  • Driver: Tetramethylammonium hydroxide is extensively utilized as a phase transfer stimulant in the synthesis of organic silicon, such as dimethyl silicone oil, benzyl silicone oil, silicone diffusion pump oil, solvent-free silicon molding compound, organic Driver for silicone material as well as silicone rubber, and so on; as a condensation stimulant for rubber antioxidant intermediates; as a stimulant for the synthesis of zeolite and also molecular sieve. Its advantage is that warming up after the response can disintegrate it right into gas and also drive it away without staying in the item.
  • Analysis field: TMAH is an excellent methylating agent with large methylation energy and fast esterification speed. TMAH is used as a pretreatment agent when determining the composition of fatty acids by gas chromatography. Used as a supporting electrolyte in polarographic analysis; TMAH is a strong organic base and can be used as a titrant for organic acids, especially when avoiding metal ions and non-aqueous solvents, TMAH is a good choice.
  • Semiconductor field: TMAH is used as a positive resist developer in organic material etching. Organic material etching mainly refers to the removal of photoresist after development and pattern transfer; TMAH is an anisotropic material with excellent corrosion properties. Corrosive agent, good selectivity, non-toxic and does not pollute the environment. The most important thing is that TMAH is compatible with Complementary Metal Oxide Semiconductor (CMOS) process and conforms to the development trend of SOC (embedded system microprocessor). TMAH is gradually replacing KOH and other etchants as the main etchant for realizing micro-3D structures in microelectromechanical systems (MEMS) processes.
  • Semiconductor field: TMAH is used as a positive resist developer in organic material etching. Organic material etching mainly refers to the removal of photoresist after development and pattern transfer; TMAH is an anisotropic material with excellent corrosion properties. Corrosive agent, good selectivity, non-toxic and does not pollute the environment. The most important thing is that TMAH is compatible with Complementary Metal Oxide Semiconductor (CMOS) process and conforms to the development trend of SOC (embedded system microprocessor). TMAH is gradually replacing KOH and other etchants as the main etchant for realizing micro-3D structures in microelectromechanical systems (MEMS) processes.

The Principle of TMAH in TFT-LCD Industry

The programmer is a chemical service for creating silver salt film. The developer made use of to establish black and white film is called black and white developer, and the designer utilized to establish color movie is called shade developer. The main element of the designer service is the programmer. In order to improve the performance, a few other components are normally added, such as accelerators to advertise growth, protective agents to stop oxidation of the programmer, haze preventions and also anti-fogging agents to prevent fog formation. Programmers with various residential properties can be gotten by readjusting various amounts of each component, such as particle developers, high-contrast developers, and the like.

  • Classification of developing solution: positive developing solution, negative developing solution.
  • Developing principle: dissolve the exposed photoresist with an aqueous developer solution with a concentration of 2.38%, so that the exposed photoresist dissolves quickly and completely in a relatively short period of time, leaving a contrast pattern.

References

  1. Tetramethylammonium hydroxide – WikiPedia
  2. Walker, J.; Johnston, J. (1905). “Tetramethylammonium hydroxide”J. Chem. Soc., Trans87: 955–961. 

Tetramethylammonium Hydroxide Supplier and Manufacturer

As a tetramethylammonium hydroxide supplier and manufacturer with a strict standard product quality system certificate, Zhishang Chemical has long been providing the best tetramethylammonium hydroxide raw materials to customers all over the world.

Over the years, relying on professional team experience and customer-centric team concept to meet customer needs in a timely manner, our company enjoys a high reputation in the world. At present, our company has served more than 6,000 customers and has established long-term cooperative relations with customers from many countries.

If you have a demand for tetramethylammonium hydroxide and related products, please contact our service staff Zhishang Chemical – White directly, and we will provide you with high-quality products at the best price.

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