Version 2 2024-03-21, 19:27Version 2 2024-03-21, 19:27
Version 1 2024-02-23, 22:43Version 1 2024-02-23, 22:43
journal contribution
posted on 2024-03-21, 19:27authored byK. Palani Thiruppathi, Subhasish Basu Majumder
Growth of exposed crystal facets has received considerable
attention
because of their coordinatively unsaturated surface atoms and defect-related
surface reactivities. Herein, LiFeO2 truncated octahedra
exposed with 6 {100} facets and 8 {111} facets were prepared through
a simple microwave-assisted hydrothermal method without using any
additives, surfactants, and calcination processes. The detailed growth
process revealed that the formation of LiFeO2 truncated
octahedra occurred only at the optimized reaction temperature (180
°C), time (30 min), and reactant concentrations. The prepared
LiFeO2 truncated octahedra showed excellent sensing responses
toward aliphatic organic compounds compared to that against aromatic
organic compounds and poor response to inorganic compounds. The response
percentages of 150 ppm concentrations of acetone, ethanol, formaldehyde,
and isopropyl alcohol are 81.84, 62.91, 62.68, and 69.41%, respectively,
at a low operating temperature (100 °C). The presence of exposed
facets with their coordinatively unsaturated Li/Fe surface atoms such
as 5-fold {100}, 3-fold {111}, 3-fold {100}–{111}, 2-fold {111}–{111},
and 2-fold coordination with the O atom in the vertices facilitated
more oxygen vacancies and led to improved surface reactivities as
well as sensitivity.