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The response and recovery properties at DC 5 V with an Li doping level of (a) 0, (b) 1.0, (c) 4.0, and (d) 8.0 wt %, respectively, at different relative humidity values; The comparison of (e) the response time and (f) the recovery time of different Li+-doped SnO2 PNFs at relative humidity levels of 54% and 75%, respectively.
