JP2016502600A - 微小電極を備えた電解セル - Google Patents
微小電極を備えた電解セル Download PDFInfo
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Abstract
Description
− リソグラフィ法によって、予め定めたパターンに従うフィンガーを基板に設ける工程、
− 場合により、気相の物理的析出法または化学的析出法(PVDまたはCVD)によって、Co、Cr、Mo、W、Ni、Tiおよびこれらの合金からなる群から選択される金属の層でフィンガーを被覆する工程、
− 前記の金属を被覆したフィンガーの上に気相の物理的析出法または化学的析出法によって外側の電極層を付与する工程。
200mmの直径と2mmの厚さを有していて1μmの厚さのSiO2の上層を設けた円形のシリコンウエーハの上に、MEMSフォトリソグラフィ法によって櫛歯をからませた形のパターンを転写した。次いで、ウエーハの表面を、30%のKOHを用いて室温で15分にわたってエッチングに供した。このようにして得られたウエーハの上に、すなわち、選択した微小電極のパターンに従う絶縁スクリーン(遮断材)を適切に設けたウエーハの上に、物理的気相析出法(PVD)によってチタンの層を堆積した。次いで、やはり物理的気相析出法によって白金の電極触媒層を堆積したが、これを次の二つの段階で行った。第一の堆積においては、基板(ターゲット)の主軸を水平面から45度傾けた状態で維持し、それにより、基板上にパターン形成したフィンガーの第一の面上に電極触媒を堆積し、そして第二の段階においては、基板を反対方向で水平面から45度傾けた状態で維持し、それにより、パターン形成したフィンガーの第二の面上に電極触媒を堆積した。微小セルの製造後の熱処理を、5℃/分の温度勾配を用いて、アルゴンでパージした雰囲気中で500℃において1時間にわたって行った。熱処理工程については、他の種類の不活性環境または還元性環境(例えば、水素でパージした雰囲気)も適しているかもしれない。レーザー法によって、100マイクロメートルの電極間の隔たりと0.01μmの平均の電極表面粗さRaが測定された。
200mmの直径と2mmの厚さを有していて1μmの厚さのSiO2の上層を設けた円形のシリコンウエーハの上に、マイクロ波アシスト化学的気相析出法(CVD)とレーザーエッチングを用いてSiO2の上にホウ素ドープダイヤモンド薄膜を直接に成長させ、その結果、6000ppmのホウ素添加量を有する約6μmの厚さの電極を得た。レーザー法によって、86マイクロメートルの電極間の隔たりと0.02μmの平均の電極表面粗さRaが測定された。
実施例2に記載したセルを、5、10および25℃において水道水中のメチルオレンジ溶液を用いる電気化学的な酸化剤の生成とEOD(電気化学的酸素要求量)の処理のための試験に供した。
Claims (15)
- 分離されないアノード生成物とカソード生成物を生成させるための電解セルであって、表面を有するリソグラフィ法によってパターン形成できる基板から成り、多数のアノードとカソードの微小電極が前記表面の上に形成されていて、前記アノードとカソードの微小電極は100マイクロメートル未満の電極間の隔たりをおいて互いに間に入って存在し、またそれらの微小電極は0.05μm未満の平均表面粗さRaを有する、前記電解セル。
- 前記平均表面粗さRaは0.01μm未満である、請求項1に記載の電解セル。
- 少なくとも前記アノードの微小電極は真空蒸着したホウ素ドープダイヤモンド薄膜からなる外側の層を含む、請求項1または2に記載の電解セル。
- 前記微小電極はPt、Pd、Ir、Ru、Rh、NbおよびTiからなる群から選択される少なくとも一つの元素を含む材料で形成された外側の層を含む、請求項1または2に記載の電解セル。
- 前記リソグラフィ法によってパターン形成できる基板は半導体材料から成る、請求項1から4のいずれかに記載の電解セル。
- 前記外側の層と前記リソグラフィ法によってパターン形成できる基板の間に挿入されたCo、Cr、Mo、W、Ni、Tiおよびこれらの合金からなる群から選択される金属材料の中間層を含む、請求項4に記載の電解セル。
- 前記外側の層は少なくとも5000ppmのホウ素添加量を有するホウ素ドープダイヤモンド薄膜から成る、請求項3に記載の電解セル。
- 電解セルを製造する方法であって:
− リソグラフィ法によって、予め定めたパターンに従うフィンガーを基板に設ける工程;
− 気相の物理的析出法または化学的析出法によって、Co、Cr、Mo、W、Ni、Tiおよびこれらの合金からなる群から選択される金属の層で前記フィンガーを被覆する工程;
− 前記の金属を被覆したフィンガーの上に気相の物理的析出法または化学的析出法によって外側の電極層を付与する工程;
を含む前記方法。 - 前記外側の電極層はPt、Pd、Ir、Ru、Rh、NbおよびTiからなる群から選択される少なくとも一つの元素を含む材料を含む、請求項8に記載の方法。
- 電解セルを製造する方法であって:
− SiO2の層を上に設けた、リソグラフィ法によってパターン形成できる基板を用意する工程;
− マイクロ波アシスト化学的気相析出法によって、ホウ素ドープダイヤモンド薄膜で前記基板を被覆する工程;
を含む前記方法。 - 前記リソグラフィ法はMEMSフォトリソグラフィ、MEMSレーザーエッチングまたはこれら二つの組み合わせである、請求項8から10のいずれかに記載の方法。
- 可変的な組成の混合酸化剤の溶液を製造する方法であって、請求項1から7のいずれかに記載のセルと合体させたマイクロプロセッサーを用いて、可変的な電流密度において直流電流をプログラムで設定して適用することを含む、前記方法。
- 前記混合酸化剤の溶液は、オゾン、酸素ラジカル、発生期の酸素、過酸化物、次亜塩素酸塩イオンおよび発生期の塩素から選択される少なくとも一つの化学種を含む、請求項12に記載の方法。
- 前記セルに有機物質で汚染された水性電解質が供給される、請求項12または13に記載の方法。
- 請求項1から7のいずれかに記載の少なくとも一つのセルを備え付けた、滅菌性物質、消毒性物質または洗浄性物質を供給するための装置。
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