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Using Flexible Gold-Titanium Reaction Cells to Simulate Pressure-Dependent Microbial Activity in the Context of Subsurface Biomining
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Effective one-step gold dissolution using environmentally friendly low-cost reagents.

Angela Serpe1, Luciano Marchiò, Flavia Artizzu

  • 1Dipartimento di Scienze Chimiche e Geologiche and Spin Off 3R Metals Ltd, Research Unit of INSTM, Università di Cagliari, SS554, Bivio per Sestu, 09042 Monserrato, Italy. serpe@unica.it

Chemistry (Weinheim an Der Bergstrasse, Germany)
|June 22, 2013
PubMed
Summary
This summary is machine-generated.

Researchers discovered that mixtures of tetraethylthiuram disulfide (Et4TDS) and iodine (I2) in acetone can dissolve gold. These mixtures also selectively etch gold from thin-film structures under mild conditions.

Keywords:
chelatesdiiodineetchinggoldiodinetetraethylthiuram disulfide

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Area of Science:

  • Materials Science
  • Chemistry
  • Metallurgy

Background:

  • Elemental gold dissolution is crucial for applications in electronics and catalysis.
  • Existing gold dissolution methods often involve harsh chemicals or complex procedures.
  • Developing selective and efficient gold etching techniques is an ongoing challenge.

Purpose of the Study:

  • To investigate the efficacy of tetraethylthiuram disulfide (Et4TDS) and iodine (I2) mixtures in acetone for dissolving elemental gold.
  • To explore the formation of gold complexes with varying stoichiometry based on mixture composition.
  • To evaluate the potential of these mixtures for homogeneous and selective gold layer etching from thin-film structures.

Main Methods:

  • Preparation of mixtures of Et4TDS and I2 in acetone.
  • Dissolution experiments with elemental gold.
  • Complexation studies to determine stoichiometry.
  • Etching experiments on Si/SiO2/Ti/Au thin-layered structures.

Main Results:

  • Mixtures of Et4TDS and I2 in acetone effectively dissolve elemental gold.
  • Valuable gold complexes are formed, with stoichiometry dependent on the Et4TDS/I2 ratio.
  • Homogeneous and selective etching of gold layers from Si/SiO2/Ti/Au structures was achieved under mild conditions.

Conclusions:

  • Et4TDS/I2/acetone mixtures offer a novel and effective method for gold dissolution and complexation.
  • These mixtures provide a selective and mild approach for etching gold layers in microelectronic fabrication.
  • The findings open avenues for new gold recovery and processing techniques.