Highly Sensitive H₂ Sensors Based on Co₃O₄/PEI-CNTs at Room Temperature

Figure 2

TEM characterization of CNT-sCo₃O₄ composite materials fabricated via the hydrothermal method at 180, 190, and 200°C: low-magnification and high-resolution TEM images of Co180 (a) and Co190 (b, c) and low-magnification TEM image and SAED of Co200 (d).

(a)

(b)

(c)

(d)