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Phosphorene ÀÇ ÇÕ¼º°ú Scale-up °ü·Ã »õ·Î¿î white paper °¡ North Carolina ´ëÇб³¿¡¼­ ¹ß°£µÇ¾ú´Ù.

ÀÌ ³í¹®Àº ¿µ±¹ Silverson »çÀÇ L5M-A lab. high shear mixer ¸¦ ÀÌ¿ëÇÏ¿© Black Phosphorous Crystal (È渰) À» exfoliation ÇÏ´Â ¹æ¹ýÀ» º¸¿©ÁÖ°í ÀÖÀ¸¸ç ¶ÇÇÑ 2D phosphorene ÀÇ ´ë·® »ý»ê¹ýÀ» ¼³¸íÇÏ°í ÀÖ´Ù.




Phosphorene Àº two dimensional ¹°Áú·Î¼­ ºÐÀÚ ±¸Á¶¿Í Àüµµµµ°¡ graphene °ú À¯»çÇÏ¿© graphene °ú ¸¹Àº °æÀïÀÌ µÉ °ÍÀ¸·Î ¿¹»óµÈ´Ù.

L5M-A mixer º»Ã¼¿¡ square screen (SQSH) ÀåÂøÇÏ¿© high quality black phosphorous ¿Í low quality black phosphorous ¸¦ exfoliation ÇÏ´Â Å×½ºÆ®¸¦ ÇÏ¿´´Ù.

low quality black phosphorous ´Â Å©±â¿Í ¹æÇâÀÌ ¸Å¿ì ´Ù¾çÇÑ polycrystalline ÇüŸ¦ ¶ç°í ÀÖ°í ¶Ç ¼Ò·®ÀÇ red phosphorous µµ ÇÔÀ¯ÇÏ°í ÀÖ´Ù. ÀÌ °æ¿ì high shear mixing ¸¸À¸·Îµµ exfoliation ÀÌ °¡´ÉÇÏ´Ù.

ÀÌ¿¡ ¹ÝÇØ high quality black phosphorous ´Â ¹Ð¸®¸®ÅÍ Å©±âÀÇ °áÁ¤Ã¼·Î µÇ¾îÀÖ¾î grind ÇϱⰡ Èûµé´Ù. ÀÌ °æ¿ì high shear mixing °ú bath sonication À» º´ÇàÇÏ¿© exfoliation À» ÁøÇàÇÏ¿´´Ù.

L5M-A High Shear Mixer

ÀÌ ½ÇÇèµéÀº Áú¼Ò°¡½º¸¦ purging Çϸ鼭 oxygen-free and water-free Á¶°ÇÇÏ¿¡¼­ ÁøÇàµÇ¾ú´Ù.

Exfoliation of black phosphorus at the 10-gram scale

1. pulverized, high-quality black phosporous 6 ±×·¥À» 100 mL NMP ¿¡ ³Ö´Â´Ù.
2. À̸¦ bath sonicator ¿¡ ³Ö°í 2½Ã°£µ¿¾È ÃÊÀ½ÆÄó¸® ÇÑ´Ù.
3. ¿©±â¿¡ 700 mL NMP ¸¦ Ãß°¡·Î ³Ö´Â´Ù.
4. square screen (SQSH) °¡ ÀåÂøµÈ L5M-A high shear mixer ¸¦ ÀÌ¿ëÇÏ¿© 5,000 rpm ¿¡¼­ 4½Ã°£µ¿¾È ºÐ»êó¸®ÇÑ´Ù.
5. ´Ù½Ã sample À» bath sonicator ¿¡ ³Ö°í 3 ½Ã°£µ¿¾È ÃÊÀ½ÆÄ Ã³¸®ÇÑ´Ù.
6. ´Ù½Ã sample À» 5,000 rpm ¿¡¼­ 1½Ã°£µ¿¾È high shear mixing ó¸®ÇÑ´Ù.

ÀÌ °úÁ¤À» °ÅÄ¡¸é Figure 1 ÀÇ a ¿Í °°Àº suspension À» ±¸ÇÒ ¼ö ÀÖ´Ù.

´Ù½Ã ÀÌ suspension À» 20,200 G ÀÇ ¿ø½É·ÂÀ¸·Î ¿ø½ÉºÐ¸®ÇÑ ÈÄ NMP ·Î concentration ÇÏ¿© Figure 1a ¿Í °°Àº small vial ÀÇ concentrated suspension À» ±¸ÇÏ¿´´Ù. ÀÌ suspension ÀÇ 25% Á¤µµ´Â single layer phosphorene ¿´À¸¸ç (Figure 1b) 2D phosphorous flake ÀÇ Å©±â´Â Figure 1c ¿Í °°¾Ò´Ù.



Figure 1. Scaled-up production of 2D phosphorus. (a) Photograph of solutions that were exfoliated using a combination of shear mixing and sonication. In our scale-up, we used six grams of black phosphorus and 800 mL of NMP (left). We centrifuged 40 mL of this mixture at 20,200g to isolate a highly concentrated suspension containing thin pieces (right). The size distribution of 2D phosphorus in this fraction is shown in (b) and (c).












 
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