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Caption : figure s1. sem image of soms mws and result of eds (inset).

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Caption : figure s2. xrd pattern of powdered soms (black) and the result of soms refinement (red).

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Caption : figure s3. i-v curves of s-1.00 were measured statically under various rh atmosphere.

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Caption : figure s4. durability of s-1.00 was tested repeatedly under different fixed-rh levels (rh 30, 50, 70, 90, 100%) during 10 days. all tests were run with bias voltage of 10 v and under the fixed temperature (25 oc).

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Caption : figure s5. digital image of as-fabricated humidity sensors through electrophoresis method with 0 (s-0.00), 0.5 (s-0.50), 0.75 (s-0.75) and 1 kv (s-1.00) applied.

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Caption : fig s6. schematic of humidity-sensing devices fabricated by electrophoresis.