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SnSO4 modified ZnO nanoparticles have been successfully synthesized for highly sensitive and selective formaldehyde detection after sintering at 450°C in air. The ZnO/SnO2 heterojunctions and the surface sulfate play a significantly important role for the excellent formaldehyde sensing performance. Remarkably, the ZnO-3%SnSO4 sensor is able to detect ultralow concentration of formaldehyde (0.06ppm)...
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