It is hard to detect human beings in groundwater or with some dangerous substances, but spinach plants transformed with nanotechnology can do so. By embedding carbon nanotubes in leaves, American engineers transform spinach into sensors that detect explosives and wirelessly deliver the information to hand-held devices such as smartphones.
Michael Stranor, a professor of chemical engineering at the Massachusetts Institute of Technology who led the study, said the goal of the nanobiotechnology is to introduce nanoparticles into plants, giving them non-native functions.
In a paper published in the October 31 issue of the journal Nature in Materials, the researchers said they injected a nanoparticle-containing solution into the back of the leaves using a technique called "vascular perfusion" Aromatic sensors embedded in spinach leaves the strongest photosynthesis mesophyll layer. The researchers also embedded carbon nanotubes that emit a constant fluorescence signal as a reference. By comparing two fluorescent signals, it is easier to determine if the sensor detects an explosive such as an explosive molecule in the groundwater. The plant transmits it to the sensor-embedded blade in 10 minutes.
In order to read the signal, the researchers hit the laser on the leaves to excite the nanotubes in them to emit near-infrared fluorescence. Fluorescence can be detected by an infrared camera connected to a small computer. By removing the infrared filter, ordinary smart phones with camera function can detect this signal. Currently, researchers have been able to test plants 1 meter away.
Stelno said the new approach offers the possibility of overcoming plant-to-human communication barriers and can also be used to alert environmental issues such as pollution and drought. In addition, the new technology is versatile enough to scale to any plant in the future. Botanists use these sensors to better monitor the health of plants and to maximize the yield of botanical synthetic pharmaceutical compounds. Next, they will use genetically modified technology to plant plants so that plants will no longer produce chlorophyll. Instead, they will change the color of the leaves depending on the composition of the surrounding plants. The plants thus obtained do so without the need for additional devices such as infrared sensors Test mission.
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