Tetramethylammonium Hydroxide CAS 75-59-2
Tetramethylammonium Hydroxide CAS 75-59-2 With Free Sample
- Appearance:Liquid
- Purity:99.8%
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Name: Tetramethylammonium Hydroxide
CAS: 75-59-2
MOQ: 1KG
Directory Guidance on Tetramethylammonium Hydroxide
Chemical Structure
Basic Info:
| Melting point | °C |
| Boiling point | 110 °C |
| density | 0.866 g/mL at 25 °C |
| vapor pressure | 17.5 mm Hg ( 20 °C) |
| refractive index | n20/D 1.384 |
| Fp | 80 °F |
| storage temp. | Store below +30°C. |
Product Introduction:
Tetramethylammonium Hydroxide (TMAH for short) is an important organic base with the chemical formula C₄H₁₃NO. It usually exists in the form of pentahydrate with the chemical formula C₄H₂₃NO₆. It is a colorless crystalline solid with deliquescent properties and easily absorbs moisture and carbon dioxide from the air. Its aqueous solution is strongly alkaline with a pH value greater than 13, has a high electrical conductivity, a density of about 1.016 g/cm³ (25% aqueous solution), a boiling point of 110°C, and a refractive index of 1.384 (20°C).
The preparation of Tetramethylammonium Hydroxide usually adopts electrolysis. It is generated by electrochemical reaction in an electrolytic cell using tetramethylammonium chloride or tetramethylammonium bicarbonate as raw materials. For example, when tetramethylammonium chloride is used as the raw material, the anode reaction generates chlorine, the cathode reaction generates hydrogen and Tetramethylammonium Hydroxide, and the overall reaction is: 2(CH₃)₄NCl+2H₂O→2(CH₃)₄NOH+H₂↑+Cl₂↑. The Tetramethylammonium Hydroxide prepared by this method has high purity and is environmentally friendly.
In addition, it can also be used as an additive for silicone rubber and methyl silicone oil, as well as a catalyst for silicone diffusion pump oil, solvent-free silicone molding compound and silicone resin silicone rubber. In chemical analysis, it is used as a polarographic reagent and can also be used to precipitate many metal elements.
However, Tetramethylammonium Hydroxide has certain dangers. It is a toxic substance that is harmful by inhalation, skin contact and ingestion. It is also corrosive and can cause burns. Therefore, it is necessary to strictly follow safety regulations during storage and use, avoid contact with strong oxidants and strong acids, and wear appropriate protective equipment during operation.
Nature and Specifications:
| Item | Specification |
| Product Name | Tetramethylammonium Hydroxide |
| CAS No. | 75-59-2 |
| Appearance | Liquid |
| Shelf Life | 2 years |
| Packing | As your requirements |
| solubility | Methanol (Sparingly), Water (Slightly) |
| form | Solution |
| color | APHA: ≤10 |
| Odor | strong ammonia-like odor |
| PH | >13 (H2O, 20°C) |
Product service:
- Certificate Of Analysis (COA)
- Material Safety Data Sheet (MSDS)
- Route of synthesis (ROS)
- Method of Aanlysis (MOA)
- Nuclear Magnetic Resonance (NMR)
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In the electronics field, Tetramethylammonium Hydroxide is mainly used as a developer and etchant in the photolithography process. Photolithography is one of the essential processes in semiconductor production, which is used to transfer micro-nano patterns to silicon wafers or other substrates. Tetramethylammonium Hydroxide solution (usually at a concentration of 25%) is an ideal developer that can quickly dissolve the chemical bonds of the exposed part of the photoresist, thereby producing high-precision graphics.
Tetramethylammonium Hydroxide is also used for wet etching of silicon wafers. It can selectively remove some materials from the surface of the silicon wafer to form micro-nano structures, which may be important for advanced semiconductor chip and microelectromechanical system (MEMS) manufacturing. As the miniaturization and high performance of electronic devices become more and more prominent, the demand for Tetramethylammonium Hydroxide in the electronics industry continues to grow.
Tetramethylammonium Hydroxide is the most widely used polarographic reagent in chemical analysis. Polarography is an electrochemical analysis technique. The stability of Tetramethylammonium Hydroxide solution formed on the electrode surface can improve the sensitivity and accuracy of the analysis, so it can be used as a supporting electrolyte. It can also be used for the precipitation of metal ions, among which it is used for the separation and enrichment of metal elements in analytical chemistry.
Tetramethylammonium Hydroxide is an important catalyst in the field of silica gel. It can be used to produce silicone rubber, methyl silicone oil, silicone diffusion pump oil, etc. For example, in the synthesis process of dimethyl silicone oil and benzyl silicone oil, Tetramethylammonium Hydroxide can increase the reaction rate, improve product quality and performance, and can also be used as a catalyst for solvent-free silicone resin silicone rubber and silicone molding materials.
Other uses Tetramethylammonium Hydroxide is also used in many other applications that are not part of the main application areas. One of its uses includes cleaning ultra-pure cleaning agents to remove all surface contaminants from semiconductor silicon wafers and other electronic components. Another use of Tetramethylammonium Hydroxide is as a phase transfer catalyst or alkaline reagent in certain chemical synthesis processes.
High-precision development performance
In the semiconductor and microelectronics fields, Tetramethylammonium Hydroxide has significant advantages as a developer. Its high concentration solution (usually 0.2-0.26N) can quickly remove the unexposed part of the photoresist to form a precise pattern. Compared with traditional developers, it has a high development rate and strong controllability, which can significantly improve production efficiency and pattern accuracy. This high-precision development performance is essential for the manufacture of high-density, high-performance semiconductor chips and liquid crystal displays.
Versatility and wide application
Tetramethylammonium Hydroxide is not only a strong base, but also has a variety of functional properties, which makes it have a wide range of application potential in many fields. It can be used as a cleaning agent to efficiently remove organic impurities on the surface of semiconductors; as an etchant to dissolve materials such as silicon and aluminum oxide; as a chemical polishing agent to improve the surface flatness of silicon wafers; as a complexing agent to prepare catalysts and analytical reagents; and as a surfactant to improve the wettability and dispersibility of material surfaces. This versatility makes Tetramethylammonium Hydroxide indispensable in the fields of semiconductors, electronics, chemical engineering, and materials science.
Environmental friendliness and safety
Compared with traditional strong bases (such as potassium hydroxide), Tetramethylammonium Hydroxide exhibits lower corrosiveness and higher safety in certain applications. For example, in mask cleaning, it can effectively remove oil-like pollutants while reducing physical damage to the mask. In addition, the production process of Tetramethylammonium Hydroxide (such as ion membrane electrolysis) is more environmentally friendly, no chlorine is produced, and the output product is of high purity, which meets the requirements of modern industry for environmental protection and sustainable development.
Strong adaptability and wide range of applications
Tetramethylammonium Hydroxide is highly adaptable and has a wide range of applications. It not only plays a key role in high-precision semiconductor manufacturing, but also has important applications in the silicone industry, coatings, pigments and analytical chemistry. This wide adaptability makes it a very valuable multifunctional chemical. With the continuous advancement of technology, its application areas are still expanding.
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