The corresponding I d output characteristics also shows an increasing trend with the decreasing of scan speed, and reaches a saturated value of 272 μA when the scan speed is less than 4 μm s −1 (Supplementary Fig. 5d–e ).
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The corresponding I d output characteristics also shows an increasing trend with the decreasing of scan speed, and reaches a saturated value of 272 μA when the scan speed is less than 4 μm s −1 (Supplementary Fig. 5d–e ).