포항공대 화학과 로고

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작성일 : 16-09-22 16:19
[2016.09]류순민교수 연구실 Ultrathin and Flat Layer Black Phosphorus Fabricated by Reactive Oxygen and Water Rinse
 글쓴이 : 관리자
조회 : 692  


Ultrathin and Flat Layer Black Phosphorus Fabricated by Reactive Oxygen and Water Rinse

 

Hyuksang Kwon, Sung Won Seo, Tae Gun Kim, Eun Seong Lee, Phung Thi Lanh, Sena Yang, Sunmin Ryu*, and Jeong Won Kim*

 

Ultrathin black phosphorus (BP) is one of the promising two-dimensional (2D) materials for future optoelectronic devices. Its chemical instability in ambient conditions and lack of a bottom-up approach for its synthesis necessitate efficient etching methods that generate BP films of designed thickness with stable and high-quality surfaces. Herein, reporting a photochemical etching method, we demonstrate a controlled layer-by-layer thinning of thick BP films down to a few layers or a single layer and confirm their Raman and photoluminescence characteristics. Ozone molecules generated by O2 photolysis oxidize BP, forming P2O5-like oxides. When the resulting phosphorus oxides are removed by water, the surface of BP with preset thickness is highly flat and self-protective by surface oxygen functional groups. This method provides a fabrication strategy of BP and possibly other 2D semiconductors with band gaps tuned by their thickness.

층상 반도체 물질인 black phosphorus(BP) 전하 이동도와 on/off 전류비 특성이 우수하여 차세대 전자소재로서 주목을 받고 있다. 특히 두께가 줄어들수록 밴드갭이 증가하기 때문에 정도에서 두께를 제어하게 된다면 다양한 응용이 이어질 있다. 해당 연구에서는 layer-by-layer 정밀도로 BP 두께를 제어할 있는 새로운 화학적 식각법을 개발하고 단일층 BP phosphorene 제작이 가능함을 시연하였다. 개발된 ozone 식각법은 기존에 알려진 O2 플라즈마 방법과는 달리 대면적 시료에도 적용 가능한 방법이며, 장차 in-situ 두께 측정을 위한 라만 분광법과도 호환된다는 장점을 가진다. 해당 결과는 2016 9 1 ACS Nano 게재되었다.


 
 

Total 70
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70 [2017.04]김성지교수 연구실 Cancer-Microenvironment-Sensitive Activatable Quantum Dot Probe in the Second Near-Infrared Window 관리자 04-20 48
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68 [2016.11]박문정교수 연구실 1 Volt-Driven Superfast Polymer Actuators Based on Single Ion Conductors 관리자 11-16 609
67 [2016.09]류순민교수 연구실 Ultrathin and Flat Layer Black Phosphorus Fabricated by Reactive Oxygen and Water Rinse 관리자 09-22 693
66 [2016.08]최희철교수 연구실 Unique Crystallization of Fullerenes: Fullerene Flowers 관리자 08-30 417
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63 [2016.06]조승환 교수 연구실 Transition-Metal-Free Regioselective Alkylation of Pyridine N-Oxides Using 1,1-Diborylalkanes as Alkylating Reagents 관리자 06-29 830
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59 [16.01월] 김원종교수 연구실 - Synergistic Nanomedicine by Combined Gene and Photothermal therapy 관리자 01-27 931
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