Seeing atoms with an atomic force microscope

TL;DR

This paper presents a hands-on educational activity that models how an atomic force microscope (AFM) works using simple materials like magnets, laser light, and photosensitive paper to demonstrate atomic-scale surface sensing.

Contribution

It introduces a low-cost, educational model of an AFM that helps students understand atomic surface sensing through a tangible, interactive activity.

Findings

Students can visualize atomic surface interactions.

The model demonstrates AFM principles effectively.

Educational engagement with nanoscale concepts is enhanced.

Abstract

In this activity, students will make a working model of an atomic force microscope (AFM). A permanent magnet attached to a compact disc (CD) strip acts as the sensor. The sensor is attached to a base made from Legos. Laser light is reflected from the CD sensor and onto a sheet of photosensitive paper. An array of permanent magnets attached to cardboard acts as the atoms on a surface. When the sensor is brought near this atomic surface the magnets will deflect the sensor, which in turn deflects the reflected laser. This deflection is recorded on the photosensitive paper, which students can take home with them.