JP6827447B2 - 表面修飾ナノ粒子 - Google Patents
表面修飾ナノ粒子 Download PDFInfo
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- JP6827447B2 JP6827447B2 JP2018143494A JP2018143494A JP6827447B2 JP 6827447 B2 JP6827447 B2 JP 6827447B2 JP 2018143494 A JP2018143494 A JP 2018143494A JP 2018143494 A JP2018143494 A JP 2018143494A JP 6827447 B2 JP6827447 B2 JP 6827447B2
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
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- C07D251/02—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings
- C07D251/12—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members
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Description
大きさが2〜100nmのオーダーであって、多くの場合、量子ドット及び/又はナノ粒子と称される粒子からなる化合物半導体の調製及びキャラクタリゼーション(characterization)に大きな関心が持たれてきた。これらの研究は、ナノ粒子におけるサイズ調整可能な電子、光学及び化学特性に主に焦点を当ててきた。生物学的ラベリング(biological labeling)、太陽電池、触媒作用、生物学的イメージング、発光ダイオードのような多様な商業的用途への適用可能性から、半導体ナノ粒子は、大きな関心を集めている。
ナノ粒子の多くの用途は、半導体ナノ粒子が、特定の媒体と相溶性を有する(compatible)ことを要求している。例えば、蛍光標識、インビボ(in vivo)イメージングや治療学などの幾つかの生物学的用途は、ナノ粒子が水性環境と相溶性を有することを要求している。その他の用途では、ナノ粒子は、芳香族化合物、アルコール、エステルやケトンなどの有機媒体中に分散可能であることが望ましい。例えば、有機系分散剤中に分散した半導体ナノ粒子を含有するインク配合物は、光起電(PV)デバイス用の半導体材料の薄膜を製造するために重要である。
608nmで赤色発光する、カドミウムフリーの量子ドットナノ粒子(CFQD)(InP/ZnS)(200mg)を、イソプロピルミリステート(100マイクロリットル)と共にトルエン(1mL)中に分散させた。混合物を約1乃至2分間50℃で加熱し、その後、室温で15時間ゆっくりと振とうさせた。HMMM(Cymel 303) (400mg)、モノヒドロキシポリジメチルシロキサン(MW 5kD) (200mg)、及びp−トルエンスルホン酸(70mg)のトルエン溶液(4mL)を、ナノ粒子分散液に加えた。混合液を脱気し、電磁撹拌機を用いて300rpmで撹拌しつつ、140℃で4時間還流させた。窒素のストリームを1時間、フラスコに通して、求核基とHMMMの反応で生じる揮発性の副産物を確実に除去した。混合物を室温まで冷めるままにし、不活性ガス下で保存した。表面修飾ナノ粒子は、未修飾のナノ粒子と比べて、蛍光量子収率の損失が小さく又は無く、発光ピーク又は半値全幅(FWHM)値に変化はなかった。表面修飾ナノ粒子は、様々な分子量の(10乃至1000kD)PDMSポリマーに良好に分散し、残留トルエンを除去した後でさえ、分散したままであった。反対に、PDMSに分散させた同じ濃度の未修飾ナノ粒子は、凝集して、ホストシリコーンから分離した。
525nmで緑色発光する、カドミウムフリーの量子ドットナノ粒子(CFQD)(InP/ZnS)(200mg)を、イソプロピルミリステート(100マイクロリットル)と共にトルエン(1mL)中に分散させた。混合物を約1乃至2分間50℃で加熱し、その後、室温で15時間ゆっくりと振とうさせた。HMMM(Cymel 303) (400mg)、トリメチロールプロパントリグリシジルエーテル(200mg)、サリチル酸(70mg)のトルエン溶液(4mL)を、ナノ粒子分散液に加えた。混合液を脱気し、電磁撹拌機を用いて300rpmで撹拌しつつ、140℃で4時間還流させた。窒素のストリームを1時間、フラスコに通して、求核基とHMMMの反応で生じる揮発性の副産物を確実に除去した。混合物を室温まで冷めるままにし、不活性ガス下で保存した。表面修飾ナノ粒子は、未修飾のナノ粒子と比べて、蛍光量子収率の損失が小さく又は無く、発光ピーク又は半値全幅(FWHM)値に変化はなかった。表面修飾ナノ粒子は、様々な分子量のエポキシポリマーに良好に分散し、残留トルエンを除去した後でさえ、分散したままであった。反対に、同じ濃度の未修飾ナノ粒子は、凝集して、ホストマトリクスから分離した。
608nmで赤色発光する、カドミウムフリーの量子ドットナノ粒子(CFQD)(InP/ZnS)(200mg)を、イソプロピルミリステート(100マイクロリットル)と共にトルエン(1mL)中に分散させた。混合物を約1乃至2分間50℃で加熱し、その後、室温で15時間ゆっくりと振とうさせた。HMMM(Cymel 303) (400mg)、モノメトキシポリエチレンオキシド(CH3O−PEG2000−OH)(400mg)、サリチル酸(50mg)のトルエン溶液(4mL)を、ナノ粒子分散液に加えた。混合液を脱気し、電磁撹拌機を用いて300rpmで撹拌しつつ、130℃で2時間還流させた。窒素のストリームを1時間、フラスコに通して、求核基とHMMMの反応で生じる揮発性の副産物を確実に除去した。混合物を室温まで冷めるままにし、不活性ガス下で保存した。表面修飾ナノ粒子は、未修飾のナノ粒子と比べて、蛍光量子収率の損失が小さく又は無く、発光ピーク又は半値全幅(FWHM)値に変化はなかった。修飾されたドットのアリコートをポリスチレン樹脂又はポリスチレンコポリマー樹脂(トルエン中5%固形分、例えば、スチレン−エチレン/ブチレン−スチレン又はスチレン−エチレン/プロピレン−スチレン(SEPS、SEBS、Kraton))と混合し、修飾されたナノ粒子は、ホストポリスチレン樹脂に非常に良く分散し、残留トルエンを除去した後でも分散したままであった。同じナノ粒子濃度にて、未修飾でそのままのナノ粒子は、凝集して、ホスト樹脂から分離した。表面修飾ナノ粒子のフィルムは均一であるが、未修飾のナノ粒子のフィルムでは、ナノ粒子は顕著に凝集した。
608nmで赤色発光する、カドミウムフリーの量子ドットナノ粒子(CFQD)(InP/ZnS/ZnO)(200mg)を、イソプロピルミリステート(100マイクロリットル)と共にトルエン(1mL)中に分散させた。混合物を約1乃至2分間50℃で加熱し、その後、室温で15時間ゆっくりと振とうさせた。HMMM(Cymel 303) (400mg)、モノメトキシポリエチレンオキシド(CH3O−PEG2000−OH)(400mg)、サリチル酸(50mg)のトルエン溶液(4mL)を、ナノ粒子分散液に加えた。混合液を脱気し、電磁撹拌機を用いて300rpmで撹拌しつつ、140℃で4時間還流させた。窒素のストリームを1時間、フラスコに通して、求核基とHMMMの反応で生じる揮発性の副産物を確実に除去した。混合物を室温まで冷めるままにし、不活性ガス下で保存した。表面修飾ナノ粒子は、未修飾のナノ粒子と比べて、蛍光量子収率の損失が小さく又は無く、発光ピーク又は半値全幅(FWHM)値に変化はなかった。
エポキシ相溶性ナノ粒子を、実施例2について説明したように調整した。エポキシ相溶性ナノ粒子を、LEDエポキシ封止剤(EX135)に加えた。封止剤と青色発光LEDチップとを用いて、LEDを調整した。図8Aは、表面修飾ナノ粒子を組み込んでいるLEDの発光曲線を示している。発光測定を、一週間毎日、その後、毎週行った。図8Bは、未修飾のナノ粒子を組み込んでいるLEDの発光曲線を示している。未修飾のナノ粒子を、最初にアクリルビーズに組み込み、その後、ビーズをエポキシに封入した。予想したように、両方のLEDの発光強度は、LEDが劣化するにつれて、時間と共に減少した。しかしながら、表面修飾ナノ粒子を組み込んでいるLEDの絶対発光強度は、未修飾ナノ粒子を組み込んでいるLEDの強度の約2倍となっている。
Claims (10)
- ナノ粒子と、
リガンド相互作用剤と、
メラミン化合物である結合/架橋剤と、
グアイフェネシンと、
を含んでおり、
前記リガンド相互作用剤は、前記ナノ粒子の表面と会合する第1の部分と、前記結合/架橋剤と結合する第2の部分とを含んでおり、
前記グアイフェネシンは前記結合/架橋剤と結合する、組成物。 - 前記ナノ粒子は、半導体ナノ粒子である、請求項1に記載の組成物。
- 前記リガンド相互作用剤はC 8 −C 20 脂肪酸である、請求項1に記載の組成物。
- 前記メラミン化合物は、ヘキサメトキシメチルメラミンである、請求項1に記載の組成物。
- 前記リガンド相互作用剤はC8−C20脂肪酸エステルである、請求項1に記載の組成物。
- 前記ナノ粒子の表面にあるキャッピングリガンドを更に含んでおり、
前記リガンド相互作用剤の第1の部分は、前記キャッピングリガンドとインターカレーションする、請求項1に記載の組成物。 - 極性溶媒を更に含む、請求項1に記載の組成物。
- アクリレートを更に含む、請求項1に記載の組成物。
- 前記半導体ナノ粒子は、CdS、CdSe、CdTe、ZnS、ZnSe、ZnTe、InP、InAs、InSb、AlP、AlS,AlAs、AlSb、GaN、GaP、GaAs、GaSb、PbS、PbSe、Si、Ge及びそれらの組合せの何れかを含む、請求項2に記載の組成物。
- インクである、請求項1に記載の組成物。
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US20160046859A1 (en) | 2016-02-18 |
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