US 11,794,462 B2
rGO-PEI/PVDF pyroelectric thin film and its preparation method
Yihe Zhang, Beijing (CN); Haitao Li, Beijing (CN); Qi An, Beijing (CN); and Wangshu Tong, Beijing (CN)
Assigned to CHINA UNIVERSITY OF GEOSCIENCES, BEIJING, Beijing (CN)
Filed by China University Of Geosciences, Beijing, Beijing (CN)
Filed on Mar. 15, 2021, as Appl. No. 17/201,178.
Claims priority of application No. 202010198967.0 (CN), filed on Mar. 20, 2020.
Prior Publication US 2021/0296555 A1, Sep. 23, 2021
Int. Cl. B32B 37/00 (2006.01); G01J 5/34 (2022.01); B32B 27/30 (2006.01); B32B 9/00 (2006.01); B32B 9/04 (2006.01); H10N 15/10 (2023.01); B32B 38/18 (2006.01); B32B 37/24 (2006.01); B32B 38/16 (2006.01); B32B 38/00 (2006.01)
CPC B32B 37/025 (2013.01) [B32B 9/007 (2013.01); B32B 9/045 (2013.01); B32B 27/304 (2013.01); B32B 38/18 (2013.01); G01J 5/34 (2013.01); H10N 15/15 (2023.02); B32B 38/162 (2013.01); B32B 38/164 (2013.01); B32B 2037/246 (2013.01); B32B 2255/205 (2013.01); B32B 2264/102 (2013.01); B32B 2264/108 (2013.01); B32B 2307/20 (2013.01); B32B 2311/04 (2013.01); B32B 2313/04 (2013.01); B32B 2327/12 (2013.01); B32B 2379/00 (2013.01); B32B 2457/00 (2013.01)] 3 Claims
OG exemplary drawing
 
1. A preparation method of a reduced graphene oxide (rGO)-polyethyleneimine (PEI)/polyvinylidene fluoride (PVDF) pyroelectric thin film, comprising:
Step 1. taking PEI as a modifier to complete chemical modification to GO (graphene oxide), and thus obtaining an rGO-PEI photothermal material after preparation comprises;
weighting GO powder and disposing the GO powder in deionized water by ultrasonic, adding KOH (Potassium hydroxide) and the PEI successively and stirring for 30 minutes to dissolve, and thus obtaining a mixed solution; and
placing the mixed solution in an oil bath at a temperature of 80° C. and stirring for reaction for 10 hours, centrifuging and washing the solution experienced reaction 3-4 times, performing freeze drying, and thus obtaining the rGO-PEI photothermal material,
Step 2. dispersing the rGO-PEI photothermal material in an ethanol solution, forming a layer of rGO-PEI photothermal material on a filter paper by means of suction filtration and drying the layer of rGO-PEI photothermal material at room temperature, and thus obtaining an rGO-PEI photothermal material layer;
Step 3. utilizing a transparent film to transfer and fix the rGO-PEI photothermal material layer on a surface of a PVDF film, and folding an edge of the transparent film and attaching the edge of the transparent film to an edge of the other surface of the PVDF film, and thus obtaining the rGO-PEI/PVDF pyroelectric thin film.