US 12,448,699 B2
Continuous preparation method of large-area single-crystal (100) copper foil
Jun Chen, Tianjin (CN); Zhimeng Hao, Tianjin (CN); Zhenhua Yan, Tianjin (CN); and Haixia Li, Tianjin (CN)
Assigned to Nankai University, Tianjin (CN); and Nankai Cangzhou Bohai New Area Green Chemical Research Co., Ltd., Cangzhou (CN)
Filed by Nankai University, Tianjin (CN); and Nankai Cangzhou Bohai New Area Green Chemical Research Co., Ltd., Cangzhou (CN)
Filed on Mar. 10, 2025, as Appl. No. 19/075,353.
Prior Publication US 2025/0290223 A1, Sep. 18, 2025
Int. Cl. C30B 1/06 (2006.01); C30B 29/02 (2006.01); C30B 29/64 (2006.01)
CPC C30B 1/06 (2013.01) [C30B 29/02 (2013.01); C30B 29/64 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A continuous preparation method of a large-area (100) single-crystal copper foil, wherein a commercial poly-crystal copper foil is connected to a reel-to-reel device, a carbon-based substrate is placed below the commercial poly-crystal copper foil, strain energy in a growth process of the single-crystal copper foil is controlled to be dominant by applying a stress in a heat treatment process in a reducing/productive atmosphere under an environment with a temperature gradient, so as to make the strain energy become a main influence factor of grain boundary migration and lattice rotation, and then the large-are (100) single-crystal copper foil is prepared; and the preparation method comprises the following steps:
step 1: pretreating the commercial poly-crystal copper foil to remove an organic layer, an oxide layer and impurities;
step 2: connecting the pretreated commercial poly-crystal copper foil to the reel-to-reel device to send the copper foil into a multi-temperature-zone tube furnace, and using the carbon-based substrate placed on a corundum plate or a quartz plate as a support below the commercial poly-crystal copper foil;
step 3: vacuumizing an interior of the multi-temperature-zone tube furnace, and introducing reducing/protecting gas to reach a preset pressure; and
step 4: heating the copper foil under the condition of continuously introducing the reducing/protecting gas until a highest temperature in a center of the copper foil is 980° C. to 1070° C., applying a stress of 80 N to 100 N per square centimeter of cross-sectional area by tightening reels of the reel-to-reel device for 10 minutes to 30 minutes, subjecting the copper foil to heat preservation for 4 hours to 15 hours at the same time, and naturally cooling the copper foil to room temperature, so as to obtain the (100) single-crystal copper foil.