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Cotton as a semiconductor

05.03.2004

Uzbek physicists have discovered that cotton fiber has the properties of a semiconductor: it greatly changes its electrical conductivity under the influence of external factors. In principle, this makes it possible to create electronic elements based on cotton.

Cleaned and combed cotton fibers in bunches of about 7000 pieces were impregnated with a 10% iodine solution, and then dried at 50 degrees Celsius. It turned out that such a beam, if an electrical voltage is applied to its ends and illuminated with ultraviolet light, changes the electrical conductivity by 12-50 times.

Silicon doped with some impurities behaves in approximately the same way. When illuminated with ordinary white light, the behavior of the fiber is more complicated: the electrical conductivity first falls, after a while it becomes higher than the original, and in the dark after a few hours it is restored to normal.

The discovered effect makes it possible to make light-sensitive elements from cotton.

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To build a wireless mesh network based on the SPBTLE-1S module, you can use the STSW-BNRG-Mesh (Mesh over Bluetooth Low Energy) protocol stack.

SPBTLE-1S Features:

Compliant with Bluetooth specification v4.2:
Master and Slave operating modes;
Simultaneous work in several roles;
High performance low power Cortex-M0 core;
Built-in memory 160 KB Flash;
RAM 24 KB with saving data in sleep mode;
Interfaces:
1xUART, 2xI2C, 1xSPI, 14xGPIO, 2xtimer, 10-bit ADC, Watchdog & RTC, DMA controller, PDM stream processor, SWD debugger;
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Built-in UART bootloader;
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Operating temperature range from -40 to 85 °C.

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