JP2011518674A - ナノワイヤ構造体 - Google Patents
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Abstract
【選択図】図7
Description
1.担体の腐食に起因するナノ粒子の接触の損失
2.溶解及び再度の堆積又はオストワルト熟成
3.表面エネルギーを最小化するためのナノ粒子の凝集
4.ナノ粒子の溶解及び水溶性イオンの移動
1)堆積をパルス堆積によって行う。すなわち、堆積パルスと、堆積が行われない拡散期間とが交互に生じる。
2)堆積を反転パルス堆積によって行う。すなわち、堆積パルスと、陽極逆パルスとが交互に生じる。
Av=π・nD/Fcosα
式中、Dはナノワイヤの平均直径であり、n/Fはナノワイヤの面密度であり、αは、テンプレートフィルムの面法線に対するナノワイヤの平均角度である。
ナノワイヤ構造体の製造は、テンプレートベースの方法に基づく。該方法の部分ステップを図1において以下のように概略的に示す。
(a)テンプレートフィルムの用意
(b)イオン照射
(b1)金層の施し
(b2)金層の電気化学的補強(任意)
(c)イオントラックのエッチングによるナノ細孔の形成
(d)ナノ細孔内でのナノワイヤの堆積
(d1)陰極層の除去(任意)
(e)テンプレートフィルムの溶解及び除去
好ましくは、方法ステップは、図1に示す順番、すなわち(a)、(b)、(bl)、(b2)、(c)、(d)、(d1)、(e)で実施される。しかしながら、基本的に、別の順序を使用することも可能であり、たとえば2つの面からエッチングを行い、その後に初めて陰極層を施す部分ステップ(ステップ(b1)及び(b2)の前に(c))も可能である(たとえば図7を参照されたい)。
(a)テンプレートフィルムの用意
(b)、(c)照射、及びイオントラックのエッチングによるナノ細孔の形成
(b1)、(b2)、(d)陰極層の生成及びナノ細孔内でのナノワイヤの堆積
(e)テンプレートフィルムの溶解及び除去
別の実施例では、エッチング時間を18分に調整した。これによって、約250nmの直径を有するナノワイヤ34が生じた。ここでは、面密度(面当たりの数)は108cm−2であった。ワイヤの電気化学的堆積のために再び反転パルス方法を使用した。40msにわたるU1=−1.4Vの堆積パルスの後、2msにわたるU2=−0.1Vの短い逆パルスと、U=−0.4Vの電圧での100msのパルス間隔とが続いた。これは、約0Vの過電圧に対応する。すなわち、逆パルスの期間中、システムは平衡状態にある。
図2〜図4を参照すると、多数のナノワイヤ34から成るナノワイヤアレイ35の電気化学的堆積は完全に、図2に示されている堆積装置82において行われる。該堆積装置は、2つの電解槽86及び88を収容する金属キャリッジを押し入れることができる金属ハウジング84から成る。金属の良好な伝熱性に起因して、コントロールされる外部熱供給によって堆積装置を温度調整することが可能である。
ナノワイヤ34を生成するためのパルス堆積方法を用いて、有利には、堆積の各時点において、ナノワイヤの長さを均一にすることができる。これは、完全性及び正確性を期さないならば、直流堆積と比較して拡散層が短く保たれるということによって説明することができる。堆積パルス間の間隔(平衡状態又は逆パルス)においては、金属イオンはナノ細孔32内に拡散することができ、それによって、各堆積パルスの開始時において、電極表面全体にてほとんど同じ集中度が存在するようになり、それによって、成長が均一となる。拡散層はほとんど重なり合うことはなく、表面における不均一性が増大することはない。
本発明においては、様々な材料から成るナノワイヤ34の構造特性も調査した。電気化学的に堆積される材料においては、たとえば、晶子のサイズをコントロールすることが可能である。これは、機械的安定性、熱輸送特性及び電気輸送特性並びに表面積、ひいては触媒活性に対しても効果を有する。したがって、多数の特性に対して意図した通りに影響を与えることができる。
触媒のために、本発明による多数のナノワイヤ構造体1を積み重ねてまとめて扱うことが可能である。しかしながら、ナノワイヤ構造体1は寸法に起因して、1mm未満の、大抵は10マイクロメートル〜数百マイクロメートルの内部寸法を有する3次元構造体であるマイクロ構造システム内に個別に組み込むのにも適している。
本発明によれば、テンプレートフィルム12、この例ではポリマーフィルムに、対応するマスクを通じて重イオンを照射することによって、非常に小さな寸法を有するナノワイヤ構造体又はナノワイヤアレイを生成することができる。事前に設けられるマスク、たとえばシャドーマスクが複数の開口又は孔を有し、各開口が後のマイクロ要素を規定する。マスクは、照射時にテンプレートフィルム12を覆い、それによって、覆われていない領域、すなわちマスクの開口において潜在イオントラック16が形成される。該潜在イオントラックは後にエッチングされてナノ細孔32となる。マイクロ要素の輪郭及び形状はしたがって、マスクによって予め与えられる。
特に、マイクロ要素は、たとえば気体流、温度を測定するための、且つ運動センサとしてのセンサ素子の製造に適している。図12を参照すると、そのようなセンサ150は、第1のマイクロ要素ナノワイヤ構造体1a及び第2のマイクロ要素ナノワイヤ構造体1aを備える少なくとも1つの測定ユニットを備える。これらのマイクロ要素ナノワイヤ構造体1aはそれぞれ、両側においてカバー層27を設けられており、2つのナノワイヤ構造体1aのそれぞれは、1つ又は2つのカバー層27によって電気的に接触される。2つのナノワイヤ構造体1aは別個に接触される。2つのナノワイヤ構造体の間に、加熱素子、たとえば電圧の印加によって加熱可能なマイクロワイヤ152が配置されている。センサ素子150の抵抗の変化は、気体流又は温度変化又は運動変化に対する基準として使用される。
Claims (17)
- ナノワイヤ構造体(1)を製造する方法であって、
(a)テンプレート(12)を用意するステップと、
(b)前記テンプレートの表面に対して少なくとも2つの異なる角度でエネルギー放射(14)を前記テンプレート(12)に照射するステップであって、該テンプレートを貫通する多数の潜在トラック(16)を生成する、照射するステップと、
(c)前記放射誘起潜在トラック(16)をエッチングして、交差して互いに結合するナノ細孔(32)から成る網(33)を形成するように、前記テンプレート(12)をエッチングするステップと、
(d)前記ナノ細孔(32)内で材料を堆積するステップであって、交差して互いに結合するナノワイヤ(34)から成る網(37)を前記ナノ細孔網(33)内で生成し、それによって、生成される該ナノワイヤ網(37)は前記テンプレートを貫通する、堆積さするステップと、
(e)前記テンプレート(12)を溶解すると共に、生じた前記ナノワイヤ網(37)から除去するステップとを含む、方法。 - 前記ステップ(b)において、前記テンプレート(12)に、少なくとも3つの異なる方向から前記エネルギー放射が照射され、該3つの方向は共通の1つの平面に存在していない、請求項1に記載の方法。
- 前記ステップ(d)の前に、前記テンプレート(12)の第1の面(12a)上に導電性金属層(26a)が施され、前記ステップ(d)において、前記ナノワイヤ網(37)は、前記ナノ細孔網(33)内で電気化学的堆積によって前記金属層(26a)上で成長する、請求項1又は2に記載の方法。
- 前記ナノワイヤ網(37)は電気化学的にパルス堆積される、請求項1〜3のいずれか一項に記載の方法。
- 前記テンプレートフィルムは、1つ又は複数の開口を備えるマスクを通じて照射され、それによって、前記潜在トラック(16)は前記マスクの前記開口の領域においてのみ生成される、請求項1〜4のいずれか一項に記載の方法。
- ナノワイヤ構造体(1)であって、請求項1〜5のいずれか一項に記載の方法によって製造可能なナノワイヤ構造体。
- ナノワイヤ構造体(1)であって、特に請求項1〜5のいずれか一項に記載の方法によって製造可能であり、多数のナノワイヤ(34)から成るアレイ(35)を備え、該ナノワイヤ(34)は異なる方向に延在し、該ナノワイヤ(34)は多数の節点(39)において互いに交差し、該ナノワイヤ(34)は前記多数の節点(39)において互いに一体化しており、それによって、該ナノワイヤ(34)は網目状に結合して網(37)を形成する、ナノワイヤ構造体。
- ナノワイヤ構造体(1)であって、前記ナノワイヤ(34)は、前記網(37)内で、少なくとも3つの所定の異なる方向に沿って延在する、請求項7に記載のナノワイヤ構造体。
- ナノワイヤ構造体(1)であって、前記3つの異なる方向は共通の1つの平面に存在しておらず、前記ナノワイヤ(34)は、2次元、特に3次元で網目状に結合している、請求項8に記載のナノワイヤ構造体。
- ナノワイヤ構造体(1)であって、前記ナノワイヤ網(37)は、電気化学的に堆積される材料から成長する、請求項7〜9のいずれか一項に記載のナノワイヤ構造体。
- ナノワイヤ構造体(1)であって、平らなマット状の形状を特徴とする、請求項7〜10のいずれか一項に記載のナノワイヤ構造体。
- ナノワイヤ構造体(1)であって、少なくとも、1つの平坦な面においてカバー層を備えず、前記ナノワイヤ網(37)は、少なくとも、該1つの平坦な面において開いている、請求項11に記載のナノワイヤ構造体。
- ナノワイヤ構造体(1)であって、前記ナノワイヤ網(37)が固く結合している基板層(27)をさらに備え、請求項7〜12のいずれか一項に記載のナノワイヤ構造体。
- ナノワイヤ構造体(1)であって、前記ナノワイヤ(34)は、結晶集合組織又は単結晶構造を有する、請求項7〜13のいずれか一項に記載のナノワイヤ構造体。
- マイクロリアクタシステムであって、
流体供給部及び流体排出部を備えるマイクロ構造チャネルシステムと、
前記流体供給部及び前記流体排出部間のリアクタ要素としての、請求項6〜14のいずれか一項に記載の少なくとも1つのナノワイヤ構造体(1)とを、
流体が、前記流体供給部から前記ナノワイヤ網(37)内の前記空間を通じて導かれ、前記流体排出部を通じて前記ナノワイヤ網から排出されることができるように備え、
前記ナノワイヤ網(37)の、オープンセル型である前記空隙構造は前記反応容積を形成し、前記ナノワイヤ(34)の前記円柱面は前記活性表面の少なくとも一部を形成し、前記流体は該活性表面と前記空隙構造内で流れている間に相互作用する、マイクロリアクタシステム。 - 触媒システムであって、
流体供給部及び流体排出部を備えるチャネルシステムと、
前記流体供給部及び前記流体排出部間の触媒要素としての、請求項6〜14のいずれか一項に記載の少なくとも1つのナノワイヤ構造体(1)とを、
流体が、前記流体供給部から前記ナノワイヤ網(37)内の前記空間を通じて導かれ、前記流体排出部を通じて前記ナノワイヤ網から排出されることができるように備え、
前記ナノワイヤ網(37)の、オープンセル型である前記空隙構造は前記触媒反応容積を形成し、前記ナノワイヤ(34)の前記円柱面は前記触媒活性表面の少なくとも一部を形成し、前記流体は該触媒活性表面と前記空隙構造内で流れている間に相互作用する、触媒システム。 - 特に気体流、温度、又は運動の測定のためのセンサ素子(150)であって、該センサ素子は、特にそれぞれ請求項5に記載の第1のナノワイヤ構造体(1)及び第2のナノワイヤ構造体(1a)を備える少なくとも1つの測定ユニットであって、前記ナノワイヤ構造体(1、1a)はそれぞれ、それぞれの該ナノワイヤ構造体の接触のために、前記ナノワイヤ(34)に結合している少なくとも1つの基板層(27)を備え、前記ナノワイヤ構造体間に加熱素子(152)が配置されている、少なくとも1つの測定ユニットを備える、センサ素子。
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| WO2013137018A1 (ja) * | 2012-03-15 | 2013-09-19 | 古河電気工業株式会社 | 金属ナノネットワークおよびその製造方法並びにそれを用いた導電フィルム、導電基材 |
| JP5535413B2 (ja) * | 2012-03-15 | 2014-07-02 | 古河電気工業株式会社 | 金属ナノネットワークおよびその製造方法並びにそれを用いた導電フィルム、導電基材 |
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