US 12,012,537 B2
Method of fluorescent nanodiamonds production
Seung Hee Han, Seoul (KR); Sung Ju Han, Seoul (KR); Min Seo, Seoul (KR); and Min Gyeong Cho, Seoul (KR)
Assigned to KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY, Seoul (KR)
Filed by KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY, Seoul (KR)
Filed on May 13, 2021, as Appl. No. 17/319,095.
Claims priority of application No. 10-2020-0064748 (KR), filed on May 29, 2020.
Prior Publication US 2021/0371742 A1, Dec. 2, 2021
Int. Cl. C09K 11/65 (2006.01); B82B 3/00 (2006.01); B82Y 20/00 (2011.01); B82Y 40/00 (2011.01); C01B 32/26 (2017.01); C01B 32/28 (2017.01); C23C 14/06 (2006.01); C23C 14/48 (2006.01); C23C 14/58 (2006.01); C30B 31/20 (2006.01); C30B 33/00 (2006.01); G01N 21/64 (2006.01)
CPC C09K 11/65 (2013.01) [B82B 3/008 (2013.01); C01B 32/26 (2017.08); C01B 32/28 (2017.08); C23C 14/0611 (2013.01); C23C 14/48 (2013.01); C23C 14/5806 (2013.01); C23C 14/5853 (2013.01); C30B 31/20 (2013.01); C30B 33/00 (2013.01); B82Y 20/00 (2013.01); B82Y 40/00 (2013.01); C01P 2002/72 (2013.01); C01P 2002/86 (2013.01); C01P 2004/04 (2013.01); C01P 2004/64 (2013.01); G01N 2021/6439 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A method of fluorescent nanodiamonds production comprising:
a first operation of preparing nanodiamonds having an average particle diameter of 10 nm or less;
a second operation of implanting plasma ions into the nanodiamonds, wherein the second operation is performed at a plasma ion implantation voltage of −10 kV or more and −40 kV or less;
a third operation of heat-treating the nanodiamonds implanted with the plasma ions under a vacuum or in an inert gas atmosphere;
a fourth operation of oxygen treatment of the heat-treated nanodiamonds in the presence of oxygen to oxidize a surface of the nanodiamonds;
a fifth operation of acid-treating the oxygen-treated nanodiamonds; and
a sixth operation of centrifuging, cleaning, and drying the acid-treated nanodiamonds;
wherein, in the second operation, the plasma ions are implanted at an incident ion dose of 1013 ions/cm2 or greater and 1020 ions/cm2 or less.