Metal assisted chemical etching

High school (ages 12+)
Science & Technology

Name:

Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/metal-assisted-chemical-etching

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. What is the scientific principle?Catalytic redox reactions at the metal-semiconductor interface
2. What is the catalyst materials?Noble metals such as Gold (Au), Platinum (Pt), and Silver (Ag)
3. What is Metal Assisted Chemical Etching (MACE)?MACE is a way to cut shapes into very hard materials like silicon using tiny metal pieces as helpers. The metal speeds up a chemical reaction that removes the material. This lets scientists create very small and precise patterns.
4. How do tiny metal helpers help carve patterns into silicon?The metal pieces, such as gold or silver, sit on the silicon surface. When the silicon is put in a special liquid, the metal helps break down the liquid and sends electrons into the silicon. Those electrons make the silicon dissolve right next to the metal, carving tiny holes or wires.

Redox Reaction: A chemical reaction involving the transfer of electrons between species, involving oxidation and reduction.
Nanofabrication: The process of designing, creating, and manipulating structures at the nanometer scale.
Photonic Crystals: Materials with a periodic structure that affect the motion of photons, analogous to semiconductors for electrons.