Detecting chemicals, measuring strain with a pencil and paper

January 22, 2014
Detecting chemicals, measuring strain with a pencil and paper
A strain gauge made of pencil and paper is deformed to compress the graphene network.

( —Sometimes solving a problem doesn't require a high-tech solution. Sometimes, you have to look no farther than your desktop.

Three students from Northwestern University's McCormick School of Engineering—an undergraduate, a master's student, and their teaching assistant—have proven that pencils and regular office paper can be used to create functional devices that can measure strain and detect hazardous chemical vapors.

A paper describing their findings, "Pencil Drawn Strain Gauges and Chemiresistors on Paper," was published January 22 in Scientific Reports, an open-access journal from the Nature Publishing Group.

The project originated in fall 2011 in McCormick's Introduction to Conducting Polymers course (MSE 337) during a discussion about the conductive properties of graphene, a one-atom thick layer of carbon that can be parsed from regular pencil lead. (A misnomer, pencil "lead" actually comprises graphite in a clay binder.)

"When you draw a line on a piece of paper, the graphite may shed numerous graphene sheets," said Jiaxing Huang, associate professor of and engineering who taught the course and who was a co-author on the paper. "A student asked, 'Can we use that graphene for something?' That started an exploration of what pencil traces can do."

One team of students—including lead authors Cheng-Wei Lin (MS materials science '13) and Zhibo Zhao (BS materials science '13)—started by measuring the conductivity of a pencil trace on paper, then used the traces to create a rudimentary electrode. They learned that curling the paper in one direction increased the trace's conductivity by compressing the conductive graphene particles. Curling the paper in the other direction loosened the graphene network and decreased conductivity.

Detecting chemicals, measuring strain with a pencil and paper
A pencil-drawn chemiresistor can detect the presence of hazardous gases.

The students then turned to the traces of a bendable toy pencil. (These novelty pencils are flexible because the graphite is mixed not with clay, but with a polymer binder.) Again, conductivity could be increased and decreased by manipulating the paper, but the students found it also was affected by the presence of volatile chemical vapors, such as those from toxic industrial solvents.

When the chemical is present, the polymer binder absorbs the vapors and expands, pushing the network apart and decreasing conductivity. The conductivity decreased the most in the presence of vapors that are more readily absorbed by the polymer binder.

These types of chemical sensor—also called "chemiresistors"—are key elements in "electronic noses" for detecting toxic chemical vapors. In creating chemiresistors, researchers often use more expensive materials, such as networks of carbon nanotubes or metal nanoparticles, and need to disperse them in polymer matrix to form a network.

"Now our students showed that this can be done simply with a pencil and paper—and it works," Huang said. "This is a great example showing how curiosity leads to innovative work."

Other applications of the -and-paper technology could be more unconventional. "It could help to inspire some new form of art," Huang said. "Perhaps one can make 'smart' and interactive drawings, in which the art itself is the circuitry and can respond to the environment."

In addition to Lin, Zhao, and Huang, Jaemyung Kim (PhD materials science '13), who served as teaching assistant for the course, co-authored the .

Explore further: Researchers develop method to inkjet print highly conductive, bendable layers of graphene

More information: … /full/srep03812.html

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not rated yet Mar 01, 2014
Theses students discover a quite old simple detector.
Method not new, 30 years ago, I remember measuring the resisitivity of ordinary graphite pencil on paper, to have simple resistances of high value, function of the thickness and width of the graphite trace, but it is so much sensitive to any thing that it is not reliable and not reproductible.
Beside to small stress on the paper, it is also very sensitive to gaz, like some alcool of wine that you drank before !!
The graphite absorb gaz and change the resistivity between tuneling contacts, very variable with temperature !!
Anyone can make this very amusing inexpensive detector of any thing : stress, gaz, temperature, sounds, light by heating, winds, etc...
In cryogeny, since one century, the graphite grains resistance is used as sensitive temperature detector.
Bell Graham used graphite contacts sensitivity as a microphone 130 years ago for his phone !!
Amusing how this old technology is discovered again and useful.

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