We present an ultralow-power, highly sensitive, and miniaturized
X-ray sensor with micropatterned single-walled carbon nanotube (SWCNT)
interdigitated networks inspired by the Geiger-Mueller counter design.
Due to the unique nanostructured surface and superb electronic transport
nature of assembled SWCNTs, a strong electric field is formed between
and within highly organized SWCNT interdigitated electrodes, which
effectively separates electrons and ionized ions created by incident
X-rays into electrodes, facilitating electron detection. As a result,
the device can detect a low X-ray dose rate (9.97 μGy·s–1) with an extremely low power consumption of 80–90
fW, demonstrating a sensitivity of up to 203.96 μC·Gy–1·cm–2. Furthermore, the interdigitated
SWCNT electrode design produces a low noise level in the picoampere
range, permitting exceptional real-time signal detection during X-ray
exposure. These unique features of our SWCNT X-ray sensing device
enable various low SWaP (size, weight, and power) radiation detectors
in the fields of medicine, homeland security, and defense.
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