JP4982895B2 - Zinc oxide nanocrystals and nanocomposites - Google Patents
Zinc oxide nanocrystals and nanocomposites Download PDFInfo
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本発明は、酸化亜鉛ナノクリスタルおよびナノコンポジットに関し、特に、凝集せず長時間にわたって安定である、酸化亜鉛ナノクリスタルおよびこれにポリマーをグラフト化し機能材足り得るナノコンポジットに関する。 The present invention relates to zinc oxide nanocrystals and nanocomposites, and more particularly to zinc oxide nanocrystals that are stable and do not aggregate for a long time, and nanocomposites that can be grafted with a polymer and have sufficient functional materials.
従来、酸化亜鉛は電極材、半導体、発光材料として注目され、特に、結晶性のよい酸化亜鉛微粒子は発光特性等も良好であるため研究が進んでいる。 Conventionally, zinc oxide has attracted attention as an electrode material, a semiconductor, and a light-emitting material. In particular, zinc oxide fine particles having good crystallinity have good light-emitting characteristics and the like, and research has been advanced.
しかしながら、従来の技術では以下の問題点があった。
酸化亜鉛粒子は、粒径が小さいほど凝集しやすく、時間の経過と共に大きくなってしまう性質があった。特に、ナノ粒子（ナノクリスタル）でこの傾向は強く、数ナノメートルの粒子は比較的短時間で数十ナノメートルの粒子に凝集してしまっていた。
However, the conventional technique has the following problems.
Zinc oxide particles tend to aggregate as the particle size decreases, and have a property of becoming larger with time. In particular, this tendency was strong with nanoparticles (nanocrystals), and particles of several nanometers aggregated into particles of several tens of nanometers in a relatively short time.
一方、結晶性の観点からすると凝集は構造的欠陥と粒径のばらつきを招来し、導電性、半導体特性、光学的性質など酸化亜鉛の様々な魅力的な特性を低下させてしまうという欠点があった。 On the other hand, from the standpoint of crystallinity, agglomeration leads to structural defects and variations in grain size, which degrades various attractive properties of zinc oxide such as conductivity, semiconductor properties, and optical properties. It was.
また、粒径の変化を抑え、均一なサイズであって、粒度分布の狭い（すなわち単分散の）酸化亜鉛を製造することは、酸化亜鉛をナノ材料として使用する上で重要であるため、安定なナノメートルオーダーの酸化亜鉛結晶には潜在的な需要が存在している。 In addition, the production of zinc oxide with a uniform particle size and narrow particle size distribution (ie monodisperse) is important for the use of zinc oxide as a nanomaterial, and thus stable. There is a potential demand for new nanometer order zinc oxide crystals.
本発明は上記に鑑みてなされたものであって、凝集せずに長時間にわたり安定である、粒径が数ナノメートルの酸化亜鉛結晶粒子を提供することを目的とする。 The present invention has been made in view of the above, and an object of the present invention is to provide zinc oxide crystal particles having a particle size of several nanometers that are stable for a long time without agglomeration.
また、これにポリマーをグラフト化し、機能性を有するナノコンポジットを提供することを目的とする。 Another object of the present invention is to provide a nanocomposite having a functionality by grafting a polymer thereto.
上記の目的を達成するために、請求項１に記載の酸化亜鉛ナノクリスタルは、表面を２−ブロモ−２−メチルプロピオニル基で修飾してリビングラジカル重合の反応開始点を導入した安定酸化亜鉛ナノクリスタルである。 In order to achieve the above object, the zinc oxide nanocrystal according to claim 1, wherein the surface of the zinc oxide nanocrystal is modified with a 2-bromo-2-methylpropionyl group to introduce a living radical polymerization reaction initiation point. It is a crystal.
また、請求項２に記載の酸化亜鉛ナノクリスタルは、請求項１に記載の酸化亜鉛ナノクリスタルにおいて、紫外線照射により発光する結晶性を有することを特徴とする。 The zinc oxide nanocrystal according to claim 2 is characterized in that the zinc oxide nanocrystal according to claim 1 has crystallinity that emits light when irradiated with ultraviolet rays.
また、請求項３に記載のナノコンポジットは、紫外線照射により発光する結晶性を有する酸化亜鉛ナノクリスタルの表面を２−ブロモ−２−メチルプロピオニル基で修飾し、導入された重合開始点からリビングラジカル重合によってポリマーをグラフト化したナノコンポジットである。 Further, the nanocomposite according to claim 3 is obtained by modifying the surface of a zinc oxide nanocrystal having crystallinity that emits light by ultraviolet irradiation with a 2-bromo-2-methylpropionyl group, and introducing a living radical from the introduced polymerization start point. It is a nanocomposite in which a polymer is grafted by polymerization.
なお、粒径が数ナノメートルオーダーの酸化亜鉛結晶粒子は、ゾルゲル法などのいわば湿式法により得ることができる（燃焼などの反応（乾式法）は急激であるため、粒径は通常数十ナノメートル以上の大きさとなる）。このとき、濃度、反応時間、反応温度などを制御することにより粒径の調整が可能となる。また、湿式法を採用することにより、粒径のばらつきを抑え、粒度分布の狭い良好な単分散粒子を得ることが可能となる。本発明においては、ナノクリスタル（ナノ粒子，ナノ結晶）とは、一桁台のナノメートルから数十ナノメートル程度までの粒径を含むものとする。 Zinc oxide crystal particles having a particle size of the order of several nanometers can be obtained by a so-called wet method such as a sol-gel method (the reaction such as combustion (dry method) is abrupt, and the particle size is usually several tens of nanometers). It will be more than a meter). At this time, the particle size can be adjusted by controlling the concentration, reaction time, reaction temperature, and the like. In addition, by adopting a wet method, it is possible to suppress variation in particle size and obtain good monodisperse particles having a narrow particle size distribution. In the present invention, nanocrystals (nanoparticles, nanocrystals) include particle sizes ranging from single-digit nanometers to several tens of nanometers.
また、湿式法により酸化亜鉛ナノ結晶表面にＯＨ基が存在することとなるのでこれを利用して表面修飾する方法を採用することができる。また、ポリマーの長さに関してはたとえば数十ナノメートルとすることができる。ここで、リビングラジカル重合を可能としているので、ポリマーの長さ制御が可能となり、修飾後の粒径分布も単分散化させることが可能となる。 In addition, since an OH group is present on the surface of the zinc oxide nanocrystal by a wet method, a method of surface modification using this can be employed. The length of the polymer can be several tens of nanometers, for example. Here, since living radical polymerization is possible, the length of the polymer can be controlled, and the particle size distribution after modification can also be monodispersed.
本発明の酸化亜鉛ナノクリスタル（請求項１）によれば、安定的な被膜形成を含め、エステル結合により種々の属性ないし物性を酸化亜鉛ナノ結晶に付加させることが可能となる。また、この発明によれば、リビングラジカル重合の反応開始点が導入されるので、長さの揃ったポリマーをグラフト化可能となる。
また、本発明の酸化亜鉛ナノクリスタル（請求項２）によれば、いわゆる結晶性のよいナノ粒子由来の半導体的性質ないし発光特性を利用し、被膜により複合的な物性ないし機能的な物性を発揮させることが可能となる。
また、本発明のナノコンポジット（請求項３）によれば、被膜により複合的な物性ないし機能的な物性を発揮させることが可能となる。
According to the zinc oxide nanocrystal of the present invention (Claim 1), it is possible to add various attributes or physical properties to the zinc oxide nanocrystal by ester bond, including stable film formation. Moreover, according to this invention, since the reaction starting point of living radical polymerization is introduced, it becomes possible to graft a polymer having a uniform length.
Further, according to the zinc oxide nanocrystal of the present invention (Claim 2), a composite physical property or functional physical property is exhibited by the coating film by utilizing a semiconductor property or light emission property derived from a so-called good crystalline nanoparticle. It becomes possible to make it.
Further, according to the nanocomposite of the present invention (Claim 3), it is possible to exhibit composite physical properties or functional physical properties by the coating film.
特に、本発明は市販の試薬を用いて合成できるという特徴があり、工業的量産にも優れる（安価に製造できる）という利点を有する。 In particular, the present invention is characterized in that it can be synthesized using a commercially available reagent, and has the advantage that it is excellent in industrial mass production (can be produced at low cost).
本発明は、以下の方法により製造できる。
１）溶解度の高い亜鉛化合物を出発原料として、数ナノメートルの酸化亜鉛結晶の表面に末端ＯＨ基をもつ有機物を導入する。
２）次に、末端ＯＨ基を酸ブロミドで修飾し、重合開始点を導入する。
３）次に、導入された重合開始点からリビングラジカル重合によりポリマー鎖をグラフト化し、ナノコンポジットを製造する。
The present invention can be manufactured by the following method.
1) Using a highly soluble zinc compound as a starting material, an organic substance having a terminal OH group is introduced on the surface of a zinc oxide crystal of several nanometers.
2) Next, the terminal OH group is modified with acid bromide to introduce a polymerization starting point.
3) Next, the polymer chain is grafted by living radical polymerization from the introduced polymerization start point to produce a nanocomposite.
＜実施例１＞
ここでは、市販の試薬を用いて安価に本発明品を製造可能な態様について説明する。
まず、酢酸亜鉛二水和物（和光純薬工業株式会社製、型番：２６２−０１１６２、純度９９．９％）５．４８８ｇを無水エタノール（和光純薬工業株式会社社製試薬、型番：３２１−０００２５、純度９９．５％）２５０ｍｌに溶解し、エタノール中にＺｎ２＋が０．１ｍｏｌ／ｌとなるように調整した。蒸留装置を用い８０℃〜１００℃で約３時間加熱し、残留液が１００ｍｌ（蒸留液が１５０ｍｌ）となったところで、濃縮を停止した。
<Example 1>
Here, an embodiment in which the product of the present invention can be produced at low cost using a commercially available reagent will be described.
First, 5.488 g of zinc acetate dihydrate (manufactured by Wako Pure Chemical Industries, Ltd., model number: 262-01162, purity 99.9%) was added to absolute ethanol (reagent manufactured by Wako Pure Chemical Industries, Ltd., model number: 321- (00025, purity 99.5%) was dissolved in 250 ml, and adjusted so that Zn 2+ was 0.1 mol / l in ethanol. The mixture was heated at 80 ° C. to 100 ° C. for about 3 hours using a distillation apparatus, and when the residual liquid reached 100 ml (distilled liquid 150 ml), concentration was stopped.
続いて、３−ヒドロキシプロピオン酸（ＨＰＡ）（東京化成工業株式会社製、型番：Ｈ０２９７、約３０％
ｉｎ ｗａｔｅｒ）をエバポレータを用いて低温で水分除去したものを０．０５６３ｇを加え、８０℃で２時間攪拌した。攪拌終了後、０℃まで冷却した（溶液１とする）。これは、ナノ結晶の成長促進のためである。
Subsequently, 3-hydroxypropionic acid (HPA) (manufactured by Tokyo Chemical Industry Co., Ltd., model number: H0297, about 30%
0.0563 g of the water removed from the in water using an evaporator at low temperature was added and stirred at 80 ° C. for 2 hours. After the completion of stirring, the mixture was cooled to 0 ° C. (referred to as Solution 1). This is for promoting the growth of nanocrystals.
次いで、予め無水エタノール１５０ｍｌにＬｉＯＨ・Ｈ２Ｏ（和光純薬工業株式会社製、型番：１２６−０１２１１、Ａｓｓａｙ９８．０〜１０２．０％）１．４６ｇを溶解した後０℃まで冷却したものを、溶液１へ加え、超音波処理をした。 Next, LiOH.H 2 O (manufactured by Wako Pure Chemical Industries, model number: 126-01211, Assay 98.0-102.0%) 1.46 g dissolved in 150 ml of absolute ethanol in advance was cooled to 0 ° C. , Added to solution 1 and sonicated.
その後、室温で一晩攪拌後、遠心分離により白色粉末を得た。粉末は、図１に示したような３−ヒドロキシプロピオン酸で修飾された酸化亜鉛ナノクリスタルであると考えられたが、これを１Ｈ−ＮＭＲスペクトル（図２）、ＦＴ−ＩＲ（図３）、吸光スペクトル（図４）、ＸＲＤパターン（図５）を測定することにより確認した。なお、図１では、酸化亜鉛ナノクリスタル表面に３−ヒドロキシプロピオン酸が一つ修飾されているように表記されているが、実際は被膜を形成するように多数修飾されている。以降においては、適宜この物質を、ＺｎＯ／ＨＰＡと表記することとする。なお、以上の調整は、モル比でＺｎＯ：ＨＰＡ＝４０：１となる量であり、ＺｎＯ／ＨＰＡの収量は０．７５３ｇであった。 Then, after stirring overnight at room temperature, white powder was obtained by centrifugation. The powder was considered to be zinc oxide nanocrystals modified with 3-hydroxypropionic acid as shown in FIG. 1, which was analyzed by 1 H-NMR spectrum (FIG. 2), FT-IR (FIG. 3). This was confirmed by measuring the absorption spectrum (FIG. 4) and the XRD pattern (FIG. 5). In FIG. 1, the surface of the zinc oxide nanocrystal is described as being modified with one 3-hydroxypropionic acid, but in actuality, many modifications are made so as to form a film. In the following, this substance will be referred to as ZnO / HPA as appropriate. The above adjustment was such that the molar ratio was ZnO: HPA = 40: 1, and the yield of ZnO / HPA was 0.753 g.
図６は、ＺｎＯ／ＨＰＡのＴＥＭ画像である。画像から明らかなように、ＺｎＯ／ＨＰＡが数ナノサイズであることが確認できる。 FIG. 6 is a TEM image of ZnO / HPA. As is apparent from the image, it can be confirmed that ZnO / HPA is several nano-sizes.
このような大きな結晶となっている理由は、このＺｎＯ／ＨＰＡ粉末は、ＯＨ基が端部に存在しているので、凝集しやすいためと考えられる。実際、クロロホルム中で分散させＵＶライト（３６５ｎｍ）を当てると、発光が、当初青色であったのに数日でオレンジ色まで変化してしまい安定でないことが確認された。従って次に、ＺｎＯ／ＨＰＡの安定化を図ることとした。 The reason why such a large crystal is formed is considered to be that the ZnO / HPA powder easily aggregates because OH groups are present at the ends. In fact, when dispersed in chloroform and irradiated with UV light (365 nm), it was confirmed that the luminescence changed to orange in a few days, although it was initially blue, and was not stable. Therefore, it was decided to stabilize ZnO / HPA next.
安定化に際しては、この、端部にＯＨ基をもつＺｎＯ／ＨＰＡに、酸ブロミドを反応させ２−ブロモ−２−メチルプロピオニル基を導入することとした。
詳細には、まず、ＺｎＯ／ＨＰＡ０．５ｇ（約０．００２９３４ｍｏｌ）に、２−ブロモ−２−メチルプロピオニルブロミド（ＡＣＲＯＳ社製、型番：４０３０９００５０、純度９８％）１．３４ｇ（０．００５８６ｍｏｌ）、ピリジン（和光純薬工業株式会社製、型番：１６６−０５３１６、純度９９．５％）０．５ｍｌ、Ｎ，Ｎ−ジメチルアセトアミド（和光純薬工業株式会社製、型番：０４２−０２５４６、純度９８％）５．７５ｍｌを加え、窒素雰囲気下で２４時間攪拌した。このとき、上記ブロミド化合物の発熱反応を考慮し、最初の２時間は氷冷しながら反応させた。次いで、室温で２時間、その後８０℃で２０時間攪拌した。
In the stabilization, an acid bromide was reacted with ZnO / HPA having an OH group at the end to introduce a 2-bromo-2-methylpropionyl group.
Specifically, first, ZnO / HPA 0.5 g (about 0.002934 mol), 2-bromo-2-methylpropionyl bromide (manufactured by ACROS, model number: 403090050, purity 98%) 1.34 g (0.00586 mol), 0.5 ml of pyridine (manufactured by Wako Pure Chemical Industries, Ltd., model number: 166-05316, purity 99.5%), N, N-dimethylacetamide (manufactured by Wako Pure Chemical Industries, Ltd., model number: 042-02546, purity 98%) ) 5.75 ml was added and stirred for 24 hours under a nitrogen atmosphere. At this time, considering the exothermic reaction of the bromide compound, the reaction was carried out with ice cooling for the first 2 hours. The mixture was then stirred at room temperature for 2 hours and then at 80 ° C. for 20 hours.
反応終了後、５ｗｔ％のＮａＨＣＯ３ａｑ３００ｍｌにより、反応液を１時間攪拌洗浄し、塩基性を取り除き濾過した。これを更に、水３００ｍｌで１時間洗浄、濾過し、最後に、メタノールで煮沸洗浄を１時間おこなった。この操作により、白色のきめ細かな粉末が得られた。 After completion of the reaction, the reaction solution was stirred and washed with 300 ml of 5 wt% NaHCO 3 aq for 1 hour to remove the basicity and filtered. This was further washed with 300 ml of water for 1 hour, filtered, and finally boiled and washed with methanol for 1 hour. By this operation, a fine white powder was obtained.
得られた粉末は、図７に示したような、２−ブロモ−２−メチルプロピオニル基で修飾された酸化亜鉛ナノクリスタル（共有結合により２−ブロモ−２−メチルプロピオニルオキシプロピオネートが連結した酸化亜鉛ナノクリスタル）であると考えられたが、これを１Ｈ−ＮＭＲスペクトル（図８）、ＦＴ−ＩＲ（図９）を測定することにより確認した。なお、図７では、図１と同様に、修飾数が一つであるように表記されているが、実際は被膜を形成するように多数修飾されている。以降においては、適宜この物質を、ＺＨＢと表記することとする。 As shown in FIG. 7, the obtained powder was a zinc oxide nanocrystal modified with 2-bromo-2-methylpropionyl group (2-bromo-2-methylpropionyloxypropionate was linked by a covalent bond). This was confirmed by measuring 1 H-NMR spectrum (FIG. 8) and FT-IR (FIG. 9). In FIG. 7, as in FIG. 1, the number of modifications is shown as one, but in practice, many modifications are made so as to form a film. Hereinafter, this substance will be referred to as ZHB as appropriate.
図１０は、ＺＨＢの発光スペクトルである。最大波長は３９９ｎｍであった。また、この発光色は、青色であり、ＺｎＯ／ＨＰＡと異なり日数によって変化しないことを確認した。よって、ＺＨＢは凝集せず、安定であることが確認できた。 FIG. 10 is an emission spectrum of ZHB. The maximum wavelength was 399 nm. Further, it was confirmed that this luminescent color is blue and does not change depending on the number of days unlike ZnO / HPA. Therefore, it was confirmed that ZHB did not aggregate and was stable.
＜実施例２＞
ＺＨＢは、その構造から明らかなようにリビングラジカル重合が可能であり、種々のポリマーを長さを揃えてグラフト化可能となる。次に、ＰＭＭＡ（メタクリル酸メチル樹脂）を導入する例について説明する。
<Example 2>
ZHB is capable of living radical polymerization as apparent from its structure, and can be grafted with various polymers having the same length. Next, an example of introducing PMMA (methyl methacrylate resin) will be described.
ＺＨＢ０．２５ｇ（≒８．６×１０−４ｍｏｌ）に、ピリジン０．５ｍｌ、メチルメタクリレート（関東化学株式会社製、型番：Ｈ００８７）７．３９ｇ（８．６×１０−４ｍｏｌ）ＣｕＩ（関東化学株式会社製、型番：０７５２６−３２、純度９９％）０．０１６ｇ（８．６×１０−４ｍｏｌ）、Ｎ，Ｎ−ジメチルアセトアミド７ｍｌを加え、１２０℃で４時間攪拌した。攪拌終盤は粘度上昇が確認された。 ZHB 0.25 g (≈8.6 × 10 −4 mol), pyridine 0.5 ml, methyl methacrylate (manufactured by Kanto Chemical Co., Ltd., model number: H0087) 7.39 g (8.6 × 10 −4 mol) CuI (Kanto) Chemical Co., Ltd., model number: 07526-32, purity 99%) 0.016 g (8.6 × 10 −4 mol) and 7 ml of N, N-dimethylacetamide were added and stirred at 120 ° C. for 4 hours. At the end of stirring, an increase in viscosity was confirmed.
攪拌後、室温まで冷却し、５ｗｔ％のＮａＨＣＯ３ａｑ５００ｍｌにより反応液を１時間攪拌洗浄した。濾過後、過剰のクロロホルムを投入し、一晩攪拌してＣｕイオンを除去した。濾過後、濾液を濃縮し、メタノールへ滴下して再沈殿を行った。これを１時間攪拌して濾過し、乾燥させ繊維質の白色固体を得た。 After stirring, the mixture was cooled to room temperature, and the reaction solution was stirred and washed with 500 ml of 5 wt% NaHCO 3 aq for 1 hour. After filtration, excess chloroform was added and stirred overnight to remove Cu ions. After filtration, the filtrate was concentrated and added dropwise to methanol for reprecipitation. This was stirred for 1 hour, filtered and dried to obtain a fibrous white solid.
得られた固体をクロロホルムに溶解しＵＶライト（３６５ｎｍ）を当てたところ、紫色の発光が観測された。得られた固体は、図１１に示したような構造であると考えられたが、これを確認するために、１Ｈ−ＮＭＲスペクトル（図１２）、ＦＴ−ＩＲ（図１３）を測定したところ、ＰＭＭＡ鎖の存在が確認できた。また、示差熱熱重量同時測定装置を用いて測定したところ、図１４に示したように、質量損失８８％であり、ポリマー中に有機物以外の物質の存在が確認でき、約１２％ｗｔ％のＺｎＯの存在が確認できた。 When the obtained solid was dissolved in chloroform and irradiated with UV light (365 nm), purple light emission was observed. The obtained solid was considered to have a structure as shown in FIG. 11. In order to confirm this, 1 H-NMR spectrum (FIG. 12) and FT-IR (FIG. 13) were measured. The presence of the PMMA chain was confirmed. Further, when measured using a differential thermothermal gravimetric simultaneous measurement apparatus, as shown in FIG. 14, the mass loss was 88%, and the presence of substances other than organic substances in the polymer could be confirmed, and about 12% wt%. The presence of ZnO could be confirmed.
よって、得られた繊維質の白色固体は図１１に示した物質、すなわち、ナノコンポジットが合成されたことが確認できた。なお、図１１は、図１，図７と同様に修飾数が一つであるように表記されているが、実際は被膜を形成するように多数修飾されている。以降においては、適宜この物質を、ＺｎＯ／ＰＭＭＡと表記することとする。なお、ＧＰＣ（ゲル浸透クロマトグラフィー）で測定したところ、数平均分子量１２９６００、重量平均分子量１３７５００であった。なお、図１０にＺｎＯ／ＰＭＭＡの発光スペクトルを示しているが、最大波長は３９６ｎｍであった。 Therefore, it was confirmed that the obtained fibrous white solid was synthesized with the substance shown in FIG. 11, that is, the nanocomposite. In addition, although FIG. 11 is described so that the number of modifications is one like FIG. 1, FIG. 7, in fact, many modifications are carried out so that a film may be formed. In the following, this substance will be referred to as ZnO / PMMA as appropriate. The number average molecular weight was 129600 and the weight average molecular weight was 137500 as measured by GPC (gel permeation chromatography). In addition, although the emission spectrum of ZnO / PMMA is shown in FIG. 10, the maximum wavelength was 396 nm.
なお、以上の例は、エステル結合により酸ブロミドを修飾し、さらにはポリマーをグラフト化した例であるが、実施の態様はこれに限定されない。ＺｎＯ／ＨＰＡは末端にＯＨ基があるため反応性が高く、ここをエステル結合とすることにより種々の物質を付加させ修飾の自由度を向上させることが可能となる。 In addition, although the above example is an example which modified the acid bromide by the ester bond, and also grafted the polymer, the embodiment is not limited to this. ZnO / HPA has an OH group at the end and thus has high reactivity. By using this as an ester bond, various substances can be added to improve the degree of freedom of modification.
なお、発明者はヒドロキシプロピオン酸に変え、ヒドロキシ酢酸を用いても実験をおこなったが、得られた粉末は安定でないことが確認された。従って、脂肪酸を用いる場合はＣ３以上が好ましいといえ、特にヒドロキシプロピオン酸は市販されているので安価にＺｎＯ／ＨＰＡ、ＺＨＢ等を合成可能といえる。 In addition, although the inventor changed to hydroxypropionic acid and experimented using hydroxyacetic acid, it was confirmed that the obtained powder was not stable. Therefore, when using a fatty acid, it can be said that C3 or higher is preferable. In particular, since hydroxypropionic acid is commercially available, it can be said that ZnO / HPA, ZHB and the like can be synthesized at low cost.
本発明によれば、酸化亜鉛ナノクリスタルもナノコンポジットも粒径が揃っているため
光学的性質が揃い、これを利用して種々の機能材を開発可能となる。
According to the present invention, since zinc oxide nanocrystals and nanocomposites have the same particle size, optical properties are uniform, and various functional materials can be developed using this.
Claims (3)
A nanocomposite in which the surface of a zinc oxide nanocrystal having crystallinity that emits light by ultraviolet irradiation is modified with a 2-bromo-2-methylpropionyl group, and the polymer is grafted by living radical polymerization from the introduced polymerization start point.
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