JP4311134B2 - 金属酸化物超微粒子分散溶液、及び金属酸化物超微粒子薄膜 - Google Patents
金属酸化物超微粒子分散溶液、及び金属酸化物超微粒子薄膜 Download PDFInfo
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- JP4311134B2 JP4311134B2 JP2003313463A JP2003313463A JP4311134B2 JP 4311134 B2 JP4311134 B2 JP 4311134B2 JP 2003313463 A JP2003313463 A JP 2003313463A JP 2003313463 A JP2003313463 A JP 2003313463A JP 4311134 B2 JP4311134 B2 JP 4311134B2
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- metal oxide
- thin film
- ultrafine particle
- barium
- oxide ultrafine
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- 239000011882 ultra-fine particle Substances 0.000 title claims description 143
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
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- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 238000005240 physical vapour deposition Methods 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 229910052814 silicon oxide Inorganic materials 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
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- XNWFRZJHXBZDAG-UHFFFAOYSA-N 2-METHOXYETHANOL Chemical compound COCCO XNWFRZJHXBZDAG-UHFFFAOYSA-N 0.000 description 1
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- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
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- NCQPUQANCGGNSA-UHFFFAOYSA-N [Ti+4].[Ba++].CCC[O-].CCC[O-].CCC[O-].CCC[O-].CCC[O-].CCC[O-] Chemical compound [Ti+4].[Ba++].CCC[O-].CCC[O-].CCC[O-].CCC[O-].CCC[O-].CCC[O-] NCQPUQANCGGNSA-UHFFFAOYSA-N 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
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- LYXAMSAOPKFSAO-UHFFFAOYSA-N barium(2+) butan-1-olate titanium(4+) Chemical compound [Ti+4].[Ba++].CCCC[O-].CCCC[O-].CCCC[O-].CCCC[O-].CCCC[O-].CCCC[O-] LYXAMSAOPKFSAO-UHFFFAOYSA-N 0.000 description 1
- OYGHBHXXVGMBDF-UHFFFAOYSA-N barium(2+) ethanolate titanium(4+) Chemical compound [Ti+4].[Ba++].CC[O-].CC[O-].CC[O-].CC[O-].CC[O-].CC[O-] OYGHBHXXVGMBDF-UHFFFAOYSA-N 0.000 description 1
- CGUDMFBNGRVPHR-UHFFFAOYSA-N barium(2+) methanolate titanium(4+) Chemical compound [Ti+4].[Ba++].C[O-].C[O-].C[O-].C[O-].C[O-].C[O-] CGUDMFBNGRVPHR-UHFFFAOYSA-N 0.000 description 1
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- DMEGYFMYUHOHGS-UHFFFAOYSA-N heptamethylene Natural products C1CCCCCC1 DMEGYFMYUHOHGS-UHFFFAOYSA-N 0.000 description 1
- 238000001198 high resolution scanning electron microscopy Methods 0.000 description 1
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- 230000006872 improvement Effects 0.000 description 1
- 239000003350 kerosene Substances 0.000 description 1
- 229910052451 lead zirconate titanate Inorganic materials 0.000 description 1
- HFGPZNIAWCZYJU-UHFFFAOYSA-N lead zirconate titanate Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Ti+4].[Zr+4].[Pb+2] HFGPZNIAWCZYJU-UHFFFAOYSA-N 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- GYMABJMZQMPWAH-UHFFFAOYSA-N magnesium ethanolate titanium(4+) Chemical compound [Mg++].[Ti+4].CC[O-].CC[O-].CC[O-].CC[O-].CC[O-].CC[O-] GYMABJMZQMPWAH-UHFFFAOYSA-N 0.000 description 1
- OLKIFJBUVAJKPA-UHFFFAOYSA-N magnesium methanolate titanium(4+) Chemical compound [Mg++].[Ti+4].C[O-].C[O-].C[O-].C[O-].C[O-].C[O-] OLKIFJBUVAJKPA-UHFFFAOYSA-N 0.000 description 1
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- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 description 1
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- QXMHPYAPFHZWBF-UHFFFAOYSA-N strontium methanolate titanium(4+) Chemical compound [Ti+4].[Sr++].C[O-].C[O-].C[O-].C[O-].C[O-].C[O-] QXMHPYAPFHZWBF-UHFFFAOYSA-N 0.000 description 1
- 238000000859 sublimation Methods 0.000 description 1
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- JMXKSZRRTHPKDL-UHFFFAOYSA-N titanium ethoxide Chemical compound [Ti+4].CC[O-].CC[O-].CC[O-].CC[O-] JMXKSZRRTHPKDL-UHFFFAOYSA-N 0.000 description 1
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- C01B13/32—Methods for preparing oxides or hydroxides in general by oxidation or hydrolysis of elements or compounds in the liquid or solid state or in non-aqueous solution, e.g. sol-gel process
- C01B13/328—Methods for preparing oxides or hydroxides in general by oxidation or hydrolysis of elements or compounds in the liquid or solid state or in non-aqueous solution, e.g. sol-gel process by processes making use of emulsions, e.g. the kerosine process
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Description
1) 微細で粒度分布が狭くかつ結晶性の高いセラミックスナノ粒子を得るのが困難であったこと
2) 微細な粒径を保ったまま緻密な試料を得るのが困難であったこと
に起因している。また、同じ粒径であっても粉末試料と薄膜試料とを比較した場合、薄膜試料では、基板表面からのストレス等の影響から粉末試料に比べて臨界粒径が変化する可能性があり、実際、ナノ粒子レベルでいくつか強誘電特性を示すセラミックスナノ粒子薄膜の報告はあるものの、実用レベルにある作製法により平均粒径50nm以下でかつ強誘電性を示し、十分良好な誘電特性を持つセラミックスナノ粒子薄膜は得られていなかった。
化学工業、1995年4月号45項 Chem.Phys.Lett.125、299項等
→BaTiO3+6isopropanol
したがって、この場合には、バリウムイソプロポキシドとチタンイソプロポキシドの各1molに対して、3molの水が加水分解に必要となる。そして、この場合のマイクロエマルジョン中に含まれる水量は、加水分解に必要な水の量の0.95倍以上3倍以下、すなわち、2.85mol以上9mol以下であることが必要となる。
本発明の金属酸化物超微粒子薄膜は、種々の電子デバイスに使用できるものであり、例えば、図4は、積層コンデンサに適用した場合の構成の一例を示している。
このような工程を繰り返すことにより、基板7の表面には導電体電極9a、9bとセラミック層8 とが交互に複数層ずつ積層され、複数層の導電体電極9a,9bと複数層のセラミック層8とからなるセラミック−金属積層体10が形成される。
以下の実施例では、本発明の金属酸化物超微粒子薄膜を作製する際に用いられる、チタン酸バリウムの超微粒子分散溶液の作製法および該分散溶液により製造したチタン酸バリウム超微粒子薄膜を例にとって具体的に説明する。
Arガスでバブリングを行いながら、水:1−オクタノール:NP‐4:シクロヘキサン=0.2:9:7.5:150の比で混合してW/Oマイクロエマルジョン溶液とした。次にこのマイクロエマルジョン溶液に実施例1と同様の方法で調整したバリウム‐チタン複合アルコキシド溶液をマイクロエマルジョンの水量がアルコキシド原料の加水分解に必要な水量の3倍となるようにマイクロピペットで分取し、チューブポンプを用いてそれぞれのマイクロエマルジョン溶液中に導入した。そのまま1日、Ar雰囲気のグローブボックス中で攪拌混合を行い、チタン酸バリウム超微粒子分散溶液を得た。
実施例1と同様の方法でバリウム‐チタン複合アルコキシド溶液及び、マイクロエマルジョン溶液の調整を行った。調整したマイクロエマルジョン溶液に、マイクロエマルジョン中の水量がバリウム‐チタン複合アルコキシドの加水分解に必要な水量の5倍になるようにバリウムーチタン複合アルコキシド溶液をマイクロピペットを用いて分取し、チューブポンプを用いてマイクロエマルジョン溶液中に導入した。そのまま1日、Ar雰囲気のグローブボックス中で攪拌混合をを行い、チタン酸バリウム超微粒子分散溶液を得た。
Arガスでバブリングを行いながら、水:1−オクタノール:NP‐10:シクロヘキサン=5:9:7.5:150の比で混合してW/Oマイクロエマルジョン溶液とした。調整したマイクロエマルジョン溶液に、マイクロエマルジョン中の水量がバリウム‐チタン複合アルコキシドの加水分解に必要な水量の50倍になるようにバリウム‐チタン複合アルコキシド溶液をマイクロピペットを用いて分取し、チューブポンプを用いてマイクロエマルジョン溶液中に導入した。そのまま1日、Ar雰囲気のグローブボックス中で攪拌混合をを行い、チタン酸バリウム超微粒子分散溶液を得た。
(比較例3)
Arガスでバブリングを行いながら、水:1−オクタノール:NP‐10:シクロヘキサン=0.2:9:7.5:150の比で混合してW/Oマイクロエマルジョン溶液とした。調整したマイクロエマルジョン溶液に、マイクロエマルジョン中の水量がバリウム‐チタン複合アルコキシドの加水分解に必要な水量の0.75倍になるようにバリウム‐チタン複合アルコキシド溶液をマイクロピペットを用いて分取し、チューブポンプを用いてマイクロエマルジョン溶液中に導入した。そのまま1日、Ar雰囲気のグローブボックス中で攪拌混合をを行い、チタン酸バリウム超微粒子分散溶液を得た。
酢酸バリウム粉末を水に溶解させ0.1mol/lの酢酸バリウム水溶液を調整した。調整した酢酸バリウム水溶液:1−オクタノール:NP‐10:シクロヘキサン=5:9:7.5:150の比で混合してW/Oマイクロエマルジョン溶液とした。これに当量のチタンイソプロポキシドをマイクロピペットで滴下し、そのまま1日、Ar雰囲気のグローブボックス中で攪拌混合を行い、チタン酸バリウム超微粒子分散溶液を得た。
Arガスでバブリングを行いながら、水:NP‐4:シクロヘキサン=5:7.5:150の比でそれぞれ混合してW/Oマイクロエマルジョン溶液とした。次にこのマイクロエマルジョン溶液に実施例1と同様の方法で調整したバリウム‐チタン複合アルコキシド溶液をマイクロエマルジョンの水量がアルコキシド原料の加水分解に必要な水量の50倍となるようにマイクロピペットで分取し、チューブポンプを用いてマイクロエマルジョン溶液中に導入した。そのまま1日、Ar雰囲気のグローブボックス中で攪拌混合を行い、チタン酸バリウム超微粒子分散溶液を得た。
以下の実施例では、上述のマイクロエマルジョンにより合成したチタン酸バリウム分散溶液を用いて作製したチタン酸バリウム超微粒子薄膜を例にとり具体的に説明する。
実施例Aと同様の方法でチタン酸バリウム超微粒子分散溶液を得た。次に得られたチタン酸バリウム超微粒子分散溶液を用いてスピンコート法によりSi/SiO2/Al2O3/Pt基板上に数回塗布し、空気中300℃で熱処理を行なった後、RTA炉により500℃で熱処理を行い、平均粒径12.6nmから成る比較例Aのチタン酸バリウム超微粒子薄膜を得た。
実施例Aと同様の方法でバリウム−チタン複合アルコキシド原料溶液を得た後、直接、ドライ雰囲気下でスピンコート法によりSi/SiO2/Al2O3/Pt基板上に塗布し、120℃で15分間乾燥を行なった。このスピンコート及び乾燥を数回繰り返した後、RTA炉により500℃及び700℃で熱処理を行い、それぞれ平均粒径33.2nm及び45.6nmからなる比較例B,Cのチタン酸バリウム超微粒子薄膜を得た。すなわち、比較例Bは、500℃の熱処理を行った平均粒径33.2nmのチタン酸バリウム超微粒子薄膜であり、比較例Cは、700℃で熱処理を行った平均粒径45.6nmのチタン酸バリウム超微粒子薄膜である。得られたチタン酸バリウム超微粒子薄膜のSEM観察およびSPM観察の結果、実施例Aで作製された薄膜表面と比べ表面粗さは大きく、また、粒子間に多くの隙間が観察され、緻密度も小さいことが確認された。またXRD測定により、500℃で熱処理を行なった薄膜はハローピークのみが見られ結晶化していなかった。また、700℃で熱処理を行なった薄膜はチタン酸バリウムによるピークが確認されたものの、ハローピークも見られ、非晶質相も含まれていることが分かった。
原料アルコキシド溶液の調整として、Ar雰囲気のグローブボックス中でバリウムイソプロポキシド4gを2−メトキシエタノール200mlに混合して溶解し、バリウムアルコキシド溶液とした後、これに等モルのチタンイソプロポキシド溶液を滴下して一晩混合し、バリウム−チタン複合アルコキシド原料溶液を得た。得られた溶液を水蒸気存在下で攪拌を行いながら3日間エージングを行い部分的に加水分解された原料溶液を作製した。この原料溶液を用いてスピンコート法によりSi/SiO2/Al2O3/Pt基板上に数回塗布し、空気中450℃で熱処理を行なった後、さらに、RTA炉により700℃で熱処理を行い、平均粒径48.9nmのチタン酸バリウム超微粒子薄膜を得た。
2 界面活性剤
3 コサーファクタント
4 水
5 反応生成物
6 分散媒
7,13 基板
8 セラミック層
18 誘電体薄膜
20 Si/SiO2/Al2O3/Pt基板
Claims (4)
- 疎水性液体である分散媒、水および界面活性剤を含むマイクロエマルジョン中での原料の加水分解反応によって作製される平均粒径が10nm以下のチタンおよびバリウムを含むペロブスカイト型酸化物からなる金属酸化物超微粒子の分散溶液であって、
前記原料は複数の金属アルコキシドをアルコール中で混合して複合化した複合金属アルコキシド溶液からなり、
前記マイクロエマルジョンに含まれる水量が、前記原料の加水分解に必要な水量の0.95倍以上3倍以下であることを特徴とする金属酸化物超微粒子分散溶液。 - 前記複数の金属アルコキシドの少なくとも一つがバリウムアルコキシドであって、前記複合金属アルコキシド溶液は、前記バリウムアルコキシドの重合を抑制する重合抑制剤を含む請求項1に記載の金属酸化物超微粒子分散溶液。
- 請求項1または請求項2の金属酸化物超微粒子分散溶液を用いて得られた金属酸化物超微粒子薄膜。
- 平均粒径15nm以上50nm以下のチタンおよびバリウムを含むペロブスカイト型酸化物からなる金属酸化物超微粒子から構成され、残留分極(Pr)において、2Prが2μC/cm2以上の強誘電特性を有し、測定周波数1kHzにおける比誘電率が300以上であることを特徴とする請求項3に記載の金属酸化物超微粒子薄膜。
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