Abstract
Amorphous Eu0.9Ni0.1B6 nanoparticles are fabricated through a coreduction approach with the aid of phosphite ions under a liquid plasma field. This approach achieves not only better gas response/recovery time (<20 s) but also a lower detection limit (15 ppb) and higher antihumidity (relative humidity of 90%) toward formaldehyde vapor than any prior reports of formaldehyde sensing materials at 25 °C. This is attributed to the introduction of Ni that enriches Eu with more electrons and facilitates the easy transfer of electrons from Eu in Eu0.9Ni0.1B6 to O in formaldehyde. Meanwhile, Ni doping efficiently reduces the surface free energy of Eu0.9Ni0.1B6 and enhances its hydrophobicity.
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