首页|(162959)Rational design of CuO/In_2O_3 heterostructures with flower-like structures for low temperature detection of formaldehyde
(162959)Rational design of CuO/In_2O_3 heterostructures with flower-like structures for low temperature detection of formaldehyde
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NSTL
Elsevier
Rational design of metal oxide heterostructures is of great importance for gas sensors to be applicable in the detection of inflammable, explosive and toxic gases. Herein, we designed CuO/In_2O_3 heterostructures with flower-like structures via a highly efficient one-step hydrothermal technique and constructed optimal structures to improve formaldehyde sensing properties. Consequently, the obtained 7-CuO/In_2O_3 flowerlike structures with uniform p-n heterostructure and a large quantity of oxygen vacancies exhibits the best sensing properties for detecting formaldehyde. The corresponding response value is 11.67-10 ppm formaldehyde at a low operating temperature of 100 °C, which is approximately 2.97 times higher than that of pure ln_2O_3 sensor (3.93 at 200 °C). Besides, the 7-CuO/In_2O_3 sensor also exhibits good reproducibility and stability, sub-ppm-level detection limit (1.38-0.5 ppm), high selectivity, and outstanding long-term stability, which benefits from the synergistic effect of strong oxygen adsorption capacity, p-n heterojunction between CuO and ln_2O_3, catalytic effect of CuO, and the unique flower-like structures, showing the great potential for practical formaldehyde detection.
NSTL
Elsevier
