Abstract:
A method for manufacturing nitrogen doped single-walled carbon nanotubes is provided to reduce complexity of a manufacture process by performing a nitrogen doping process and a synthesis of carbon nanotubes, simultaneously. A catalyst metal layer(22) is formed on a substrate(20). The substrate on which the catalyst metal layer is formed is mounted in a reactive chamber(10). H2O plasma atmosphere is created in the reactive chamber. carbon precursor and nitrogen precursor are provided in the reactive chamber and then chemically reacted to each other, thereby growing nitrogen doped carbon nanotubes(30) on the catalyst metal layer. Upon growing of the nitrogen doped carbon nanotubes, temperature in the reactive chamber is maintained at 400 ‹C to 600 ‹C.
Abstract:
집속이온빔을 이용한 탄소나노튜브의 제조 방법이 개시된다. 개시되는 집속이온빔을 이용한 탄소나노튜브의 제조 방법은 기판을 마련하는 단계; 집속이온빔(FIB, focused ion beam)을 이용하여 상기 기판을 스캔하는 단계; 및 상기 스캔된 기판 상에 탄소나노튜브를 성장시키는 단계;를 포함한다. 그리고, 또 다른 실시예에 따른 상기 집속이온빔을 이용한 탄소나노튜브의 제조 방법은 기판을 마련하는 단계; 집속이온빔(FIB, focused ion beam)을 이용하여 상기 기판을 패터닝하는 단계; 집속이온빔(FIB, focused ion beam)을 이용하여 상기 패터닝된 기판을 스캔하는 단계; 및 상기 스캔된 기판 상에 탄소나노튜브를 성장시키는 단계;를 포함한다. 본 발명에 따른 집속이온빔을 이용한 탄소나노튜브의 제조 방법에 의하면, 나노 수준에서 기판의 미세 부위에 선택적으로 탄소나노튜브를 성장시킬 수 있을 뿐만 아니라, 다양한 패턴을 용이하게 구현할 수 있는 장점이 있다.
Abstract:
PURPOSE: A vertical CNT(Carbon NanoTube) FET(Field Effect Transistor) and a manufacturing method thereof are provided to maximize field effect of a gate and to improve on/off current by surrounding completely a carbon nano-tube channel having a depletion layer using the gate. CONSTITUTION: A first electrode(13) is formed on a substrate(10). A CNT is vertically formed on the first electrode. A second electrode(12) is formed on the CNT. A first burial layer(31) is formed on the first electrode, A second burial layer(32) is formed under the second electrode. The first and second burial layers are spaced apart from each other. A channel portion(11) of the CNT is exposed to the outside through a space between the first and second burial layers. The channel portion includes a depletion layer. The channel portion is surrounded with a gate(20) between the first and second burial layers via a gate insulating layer(21).
Abstract:
PURPOSE: A carbon nano tube FET(field effect transistor) is provided to maximize an electric field effect of a gate by using a cylindrical carbon nano tube as a channel and by making a channel region completely surrounded by the gate. CONSTITUTION: A substrate(10) is prepared. A carbon nano tube(CNT) is disposed in parallel with the plane of the substrate. A channel(11) is formed by one of a bundle of the carbon nano tubes. A source and a drain are electrically connected to both ends of the channel. A gate(20) is formed in such a way that the channel is surrounded by the gate. A gate insulation layer(21) is interposed between the gate and the channel.
Abstract:
나노와이어 형성방법 및 나노와이어를 포함하는 반도체 소자의 제조방법에 대해 개시되어 있다. 개시된 본 발명의 나노와이어 형성방법은 베이스층 상에 패턴화된 Si y Ge 1-y 층(0<y<1)을 형성하는 단계 및 상기 패턴화된 Si y Ge 1-y 층에 대한 산화공정을 실시하여 산화물층 및 그 내부에 나노와이어를 형성하는 단계를 포함하는 것을 특징으로 하는 나노와이어 형성방법을 제공한다.
Abstract:
본 발명은 탄소나노튜브(CNT)로부터 탄소불순물을 선택적으로 제거하는 방법에 관한 것으로, 밀폐된 공간 내 진공에서 황(sulfur)과 합성된 탄소나노튜브(CNT)에 부착된 불순물을 황화 반응시켜 제거시키는 것을 특징으로 하며, 더욱 상세하게는 탄소나노튜브 벽은 황과 반응하지 않고, 오직 탄소나노튜브에 부착된 탄소불순물만이 황화반응(C+2S-->CS 2 )하여 비정질 탄소만을 선택적으로 제거되는 정제방법으로 디바이스에 합성된 탄소나노튜브(CNT)로부터 탄소불순물을 황화반응에 의하여 선택적으로 제거하는 방법에 관한 것이다. 황화(Sulfidation), 탄소나노튜브(CNT), 전계효과트랜지스터(FET), 정제(Purification)
Abstract:
A method for eliminating carbonaceous impurities from carbon nano-tubes(CNT) is provided to purify CNT combined with sulfur without damage or modification of CNT by selectively removing the impurities adhered to sulfur combined CNT through sulfidization in a sealed space under vacuum condition. The method includes: first step of preparing carbon nano-tubes and sulfur in a sealed space; second step of heating the sulfur to higher than the temperature for sulfidization of carbonaceous impurities deposited on the carbon nano-tubes; and third step of removing the carbonaceous impurities from the carbon nano-tubes through sulfidization. The sulfidization temperature is higher than 150deg.C. The sulfur contained in the sealed space is a solid form of sulfur. The first step further contains formation of vacuum condition by exhausting air out of the sealed space. The second step is carried out by maintaining temperature of about 300deg.C for about 30 minutes.
Abstract:
A low temperature growth method of carbon nanotubes, which can grow single-walled carbon nanotubes of high quality in a relatively low temperature range, is provided. A low temperature growth method of single-walled carbon nanotubes comprises the steps of: preparing a vacuum chamber(10); preparing a substrate(20) on which a catalytic metal(22) is deposited within the vacuum chamber; vaporizing H2O to supply the vaporized H2O into the vacuum chamber; generating H2O plasma discharge within the vacuum chamber; and supplying a source gas into the vacuum chamber in a flux range of 20 to 60 sccm to grow carbon nanotubes(30) on the substrate in the H2O plasma atmosphere. The H2O plasma has a power controlled to 80 W or less. The carbon nanotubes are grown in a temperature range of 500 deg.C or less for 10 to 600 seconds. The catalytic metal is at least one selected from the group consisting of Fe, Ni and Co. The source gas is at least one selected from the group consisting of C2H2, CH4, C2H4, C2H6 and CO. The substrate is a substrate made of Si, SiO2 or glass.
Abstract translation:提供了一种能够在较低温度范围内生长高质量单壁碳纳米管的碳纳米管的低温生长方法。 单壁碳纳米管的低温生长方法包括以下步骤:制备真空室(10); 制备在真空室内沉积有催化金属(22)的基底(20); 蒸发H 2 O以将蒸发的H 2 O供应到真空室中; 在真空室内产生H 2 O等离子体放电; 并在20〜60sccm的通量范围内将原料气体供给到真空室中,以在H 2 O等离子体气氛中在基板上生长碳纳米管(30)。 H2O等离子体的功率控制在80W以下。 碳纳米管在500℃以下的温度范围内生长10〜600秒。 催化剂金属是选自Fe,Ni和Co中的至少一种。源气体是选自由C 2 H 2,CH 4,C 2 H 4,C 2 H 6和CO组成的组中的至少一种。衬底是由Si ,SiO2或玻璃。