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HomeProduct name listBUFFER SOLUTION

BUFFER SOLUTION

Synonym(s):4,7-Diphenyl-1,10-phenanthroline disulfonic acid disodium salt hydrate;4,7-Diphenyl-1,10-phenanthrolinedisulfonic acid;4,7-Diphenyl-1,10-phenanthroline-disulfonic acid disodium salt trihydrate;Bathophenanthrolinedisulfonic acid disodium salt trihydrate;Disodium bathophenanthrolinedisulfonate trihydrate

  • CAS NO.:53744-42-6
  • Empirical Formula: C24H17N2NaO6S2
  • Molecular Weight: 516.52
  • MDL number: MFCD00038854
  • EINECS: 258-740-7
  • SAFETY DATA SHEET (SDS)
  • Update Date: 2023-06-08 17:06:36
BUFFER SOLUTION Structural

What is BUFFER SOLUTION?

The Uses of BUFFER SOLUTION

Use of Buffer HF improved:

  • Buffer HF improved dissolves silica films (both thermally grown and silane SiO2) produced on the surfaces of silicon and exposed by photolithography. It also is capable of dissolving doped silica films such as phosphosilica and borosilica glasses as formed in semiconductor processing. The overall chemical reaction is: 4HF + SiO2 SiF4 + 2H2O
  • For trouble-free operation Buffer HF improved is recommended in the new technologies for manufacture of semiconductor planar and mesa devices. It is compatible with both negative and positive photoresists. Excellent results with good reproducibility are simple to achieve without undercutting marked oxides, surface staining or device degradation by metallic impurities.

The Uses of BUFFER SOLUTION

Used for pretreatment of planar silicon devices when plating with Nickel plating solution products 44069 and 44070.

The Uses of BUFFER SOLUTION

Use of Buffer HF improved:

Buffer HF improved dissolves silica films (both thermally grown and silane SiO2) produced on the surfaces of silicon and exposed by photolithography. It also is capable of dissolving doped silica films such as phosphosilica and borosilica glasses as formed in semiconductor processing.
The overall chemical reaction is: 4HF + SiO2 SiF4 + 2H2O
For trouble-free operation Buffer HF improved is recommended in the new technologies for manufacture of semiconductor planar and mesa devices. It is compatible with both negative and positive photoresists. Excellent results with good reproducibility are simple to achieve without undercutting marked oxides, surface staining or device degradation by metallic impurities.

Definition

ChEBI: Disodium 4,7-diphenyl-1,10-phenanthroline 4',4''-disulfonate is an organic sodium salt having 4,7-diphenyl-1,10-phenanthroline 4',4''-disulfonate as the counterion. It has a role as an iron chelator. It contains a 4,7-diphenyl-1,10-phenanthroline 4',4''-disulfonate.

General Description

Improved HF Buffer System with stabilized HF activity - selective solvent for SiO2 used in semiconductor technology of planar passivated devices - transistors, integrated circuits, diodes, rectifiers, SCR, MOS, FET

Advantages:

  • Ready-to-use - Economical
  • HF activity buffer stabilized
  • Excellent process reproducibility
  • Does not undercut masked oxide
  • Will not stain diffused silicon surfaces
  • Avoids contamination on silicon surfaces
  • Photoresist coating unaffected

Buffer HF improved is an idealized buffer preparation characterized by a high buffer index and an optimized, uniform oxide-etch rate. The composition of buffer HF improved is precisely controlled by HF activity measurements and electrometric pH. The mass balance corresponds essentially to (HF) + (F) + 2(HF2) for a two-ligand mononuclear complex and the charge balance is (H+) - (F) + (HF2- ). The HF activity is maintained constant through the specific equilibrium constant which regulates the equilibrium reaction between fluoride, bifluoride, and HF buffer components. A second equilibrium constant participates in the regulation of the hydronium in concentration of pH.

Buffer HF improved is produced and analyzed to be essentially free of impurities. Nitrate ions, a common impurity causing stains on diffused silicon surfaces, are specifically removed. Heavy metal impurities, which can lead to degradation of device characteristics, are rigidly controlled under manufacturing process specifications.

Properties of BUFFER SOLUTION

Melting point: 300 °C
Density  1.006 g/mL at 20 °C
vapor density  4.9 (vs air)
storage temp.  Inert atmosphere,Room Temperature
solubility  H2O: soluble
form  Liquid
color  No Color
Exposure limits ACGIH: TWA 2.5 mg/m3
NIOSH: IDLH 250 mg/m3; TWA 2.5 mg/m3
EPA Substance Registry System Benzenesulfonic acid, 4,4'-(1,10-phenanthroline-4,7-diyl)bis-, disodium salt (53744-42-6)

Safety information for BUFFER SOLUTION

Signal word Warning
Pictogram(s)
ghs
Exclamation Mark
Irritant
GHS07
GHS Hazard Statements H315:Skin corrosion/irritation
H319:Serious eye damage/eye irritation
H335:Specific target organ toxicity, single exposure;Respiratory tract irritation
Precautionary Statement Codes P261:Avoid breathing dust/fume/gas/mist/vapours/spray.
P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.

Computed Descriptors for BUFFER SOLUTION

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