PLEASE NOTE: The Center for Nano- and Molecular Science and Technology (CNM) at The University of Texas at Austin (UT-Austin) cannot guarantee the accuracy or the safety of these activities. Some of these activities might pose safety hazards for young children, and all activities should be performed under the supervision of a responsible parent, teacher or adult. The CNM and UT-Austin do not assume any responsibility for these activities or their results. If you have questions, corrections, or comments please do not hesitate to contact the CNM.
PB & J Lithography
Many electronic circuits are constructed by depositing or removing material one layer at a time in a carefully controlled sequence. You can replicate this technique, called lithography, by making a peanut butter and jelly sandwich.
slice of bread
four popsicle sticks
It took a few steps to generate your patterned PB&J sandwich. In real lithography, hundreds of steps are required to generate complex patterns of layered materials!
You could make an even more complex lithographic pattern on bread by using more layers, such as colored sugar sprinkles or frosting, or by using more complicated patterns for resists, such as a fork.