“…For example, Greason [2000] found that the magnitude of charge on beads in a vibrated bed decreases with increasing temperature. Additionally, Olsen et al [2018] notes that some researchers (including Wen et al [2014], Su et al [2015], and Lu et al [2017]) report a power output decrease with temperature in triboelectric nano-generators. Temperature variations may also affect the presence of contaminants on surfaces, changing their ability to gain or retain charge [Lowell and Rose-Innes, 1980].…”