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Gold etchant, standard

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Antistrumin, Potassium monoiodide
CAS Number:
MDL number:


volatiles, 50-80%

Quality Level


100 °C (lit.)
100 °C/1 atm


H2O: miscible


1.2924 g/mL at 25 °C (lit.)



InChI key


General description

Etching readily controlled with minimum undercutting. Room temperature operated. Cyanide-free for standard applications. Etch rate of 28 angstrom/sec @ 25 °C.
Gold etchant is a combination of potassium iodide and iodine as complexing agents synthesized by electrochemically oxidizing gold.


Gold etchant is a selective general-purpose etchant for gold, compatible with negative and positive photoresists. It is used to etch out gold (Au) electrodes prior to scanning electron microscopy (SEM) imaging for morphological study and metal layer for the preparation of nanoelectrodes array. Gold etchant can also be used in metal assisted chemical etching (MACE) for the fabrication of p-n junction silicon nanopillar based solar cells.


Health hazard

Signal Word


Hazard Statements

Precautionary Statements

Hazard Classifications

STOT RE 1 Oral

Target Organs


Storage Class Code

6.1D - Non-combustible, acute toxic Cat.3 / toxic hazardous materials or hazardous materials causing chronic effects



Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

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A two-step annealing process for enhancing the ferroelectric properties of poly (vinylidene fluoride)(PVDF) devices.
Park H, et al.
Journal of Material Chemistry C, 3(10), 2366-2370 (2015)
Cyanide-and thiourea-free electrochemical etching of gold for microelectronics applications.
Hu Z and Ritzdorf T
Journal of the Electrochemical Society, 154(10), D543-D549 (2007)
High performance nanopillars array silicon solar cells.
Design, Test, Integration and Packaging of MEMS/MOEMS (DTIP), 117(10), 1-5 (2013)
Scalable long-term extraction of photosynthetic electrons by simple sandwiching of nanoelectrode array with densely-packed algal cell film.
Kim J et al.
Biosensors And Bioelectronics, 117(10), 15-22 (2018)
Abhinav Sharma et al.
Scientific reports, 9(1), 5970-5970 (2019-04-14)
Cardiac troponin T (cTnT) is considered a clinical standard for its high specificity and sensitivity when diagnosing acute myocardial infarction; however, most studies on the electrical sensors of cardiac troponin biomarkers have focused on cTnI rather than cTnT. This study

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