US 12,345,679 B2
Self-powered formaldehyde sensing device
Chih-Yu Chang, Taipei (TW); Chun-Yi Ho, Taipei (TW); Yu-Hsuan Cheng, Taipei (TW); and Ying-Ying Chen, Taipei (TW)
Assigned to National Taiwan University of Science and Technology, Taipei (TW)
Filed by National Taiwan University of Science and Technology, Taipei (TW)
Filed on Dec. 21, 2022, as Appl. No. 18/069,593.
Claims priority of application No. 111134386 (TW), filed on Sep. 12, 2022.
Prior Publication US 2024/0085369 A1, Mar. 14, 2024
Int. Cl. G01N 27/416 (2006.01); G01N 27/30 (2006.01); H02N 1/04 (2006.01)
CPC G01N 27/416 (2013.01) [G01N 27/30 (2013.01); H02N 1/04 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A self-powered formaldehyde sensing device, comprising:
a triboelectric material electrode layer including a first substrate and a first electrode layer formed on the first substrate;
a triboelectric material dielectric layer including a second substrate, a second electrode layer formed on the second substrate, a dielectric reacting layer formed on the second electrode layer, and a reaction modification layer formed on the dielectric reacting layer to surface-modify the dielectric reacting layer, the reaction modification layer being a phosphomolybdic acid complex (cPMA) layer, the phosphomolybdic acid complex of the phosphomolybdic acid complex layer being obtained by dissolving 4,4′-bipyridine (BPY) in isopropanol (IPA) and then mixing with phosphomolybdic acid (PMA) solution;
an elastic spacer being disposed between the triboelectric material electrode layer and the triboelectric material dielectric layer so that the triboelectric material electrode layer and the triboelectric material dielectric layer are elastically spaced from and facing each other in a manner that the first electrode layer is facing the reaction modification layer; and
an external circuit being electrically connected between the triboelectric material electrode layer and the triboelectric material dielectric layer,
wherein, when an airflow-to-be-sensed is applied to the self-powered formaldehyde sensing device, the triboelectric material electrode layer and the triboelectric material dielectric layer are in contact with each other by propulsion of the airflow-to-be-sensed and move away from each other by an elastic restoring force of the elastic spacer, thereby generating a generation current in the external circuit by contact electrification and electrostatic induction between the triboelectric material electrode layer and the triboelectric material dielectric layer, and
when the airflow-to-be-sensed contains formaldehyde, an oxidation-reduction reaction between the reaction modification layer and formaldehyde contained in the airflow-to-be-sensed is caused, and a sensing signal current is further generated in the external circuit correspondingly.