JP4524745B2 - Metal nanowire-containing conductive material and use thereof - Google Patents
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本発明は、金属ナノワイヤーを含有した導電性材料、およびこの導電性材料によって形成した導電性ペーストや導電性塗膜などの用途に関する。 The present invention relates to a conductive material containing metal nanowires, and uses such as a conductive paste and a conductive coating film formed from the conductive material.
近年、情報端末機器の急速な小型化に伴い、実装配線幅の狭ピッチ化が進んでいる。このため導電性に優れたペーストが求められており、粒径がサブミクロンサイズの金属粒子を配合した導電性ペーストが用いらている。しかし、このようなサブミクロン金属粒子を用いた従来のペーストは導電性のばらつきが顕著であり、これを克服するためにナノサイズの粒径を有する金属微粒子を使用した導電性ペーストの開発が進んでいる。 In recent years, with the rapid miniaturization of information terminal equipment, the mounting wiring width has been narrowed. For this reason, a paste excellent in conductivity is required, and a conductive paste containing metal particles having a submicron size is used. However, the conventional paste using such sub-micron metal particles has a remarkable variation in conductivity, and in order to overcome this, the development of conductive paste using metal fine particles having nano-sized particle diameter has progressed. It is out.
例えば、インクジェット方式を利用して導電性ペーストを印刷し、配線基板の回路パターンを形成する方法において、有機溶剤を含む熱硬化性樹脂組成物中に、球状の平均粒子径１〜１００nmの金属微粒子であって表面に窒素、酸素、硫黄原子を含む化合物によって被覆したものを均一に分散させてなる導電性ペーストを用い、樹脂が熱硬化する際に、金属微粒子表面の被覆を形成している化合物を、樹脂に含まれている有機酸無水物等と反応させて除去することによって、金属微粒子相互の低温での融着行わせて微細な線幅の回路パターンを形成することが知られている（特許文献１）。しかし、従来の導電性ペーストは、金属微粒子の分散安定性を高めるために分散剤の使用量が多くなる傾向があり、導電性にばらつきが生じるとともに低温焼成域においては高い導電性を得難いと云う問題がある。
従来のナノサイズの粒径を有する金属微粒子を使用した導電性ペーストは、何れも球状の金属微粒子を用いており、高い導電性を得るために分散剤含有量および金属含有量を多くしなければならず、これに起因して上記問題を招いている。本発明は、従来の導電性ペーストにおける上記問題を解決したものであり、従来の球状金属微粒子に代えて、ナノサイズの粒径を有する微細なワイヤー状金属粒子（金属ナノワイヤー）を用いることによって、金属微粒子含有量を抑制しながらも高い導電性を有する導電性材料を得ることができるようにしたものであり、この導電性材料による導電性ペースト等を提供する。 Conventional conductive pastes using metal fine particles having a nano-sized particle diameter use spherical metal fine particles, and in order to obtain high conductivity, the dispersant content and the metal content must be increased. However, this causes the above problem. This invention solves the said problem in the conventional electrically conductive paste, and it replaces with the conventional spherical metal fine particle by using the fine wire-shaped metal particle (metal nanowire) which has a particle size of nanosize. The present invention provides a conductive material having high conductivity while suppressing the content of metal fine particles, and provides a conductive paste or the like using this conductive material.
本発明によれば以下の導電性材料が提供される。
〔１〕長軸４００nm以上および短軸５０nm以下であるワイヤー状金属繊維（金属ナノワイヤーと云う）と、長軸４００nm未満であってアスペクト比が２〜１０のロッド状金属繊維（金属ナノロッドと云う）とをバインダー（樹脂）に配合してなり、金属ナノワイヤーおよび金属ナノロッドは界面活性剤を含む水溶液中で金属イオンを還元する方法で形成されたものであり、金属ナノワイヤーおよび金属ナノロッド（金属ナノ繊維）の量がバインダー１００重量部に対して５〜１９００重量部であることを特徴とする金属ナノワイヤー含有導電性材料。
〔２〕金属ナノワイヤーおよび金属ナノロッドと共に、分散剤および分散媒をバインダー（樹脂）に配合してなる上記[１]に記載する金属ナノワイヤー含有導電性材料。
〔３〕窒素原子および／または硫黄原子を含有する分散剤を用いる上記[２]に記載する金属ナノワイヤー含有導電性材料。
〔４〕上記[１]〜上記[３]の何れかに記載する金属ナノワイヤー含有導電性材料によって形成された導電性ペースト。
〔５〕上記[１]〜上記[３]の何れかに記載する金属ナノワイヤー含有導電性材料によって形成された配線材料。
〔６〕上記[１]〜上記[３]の何れかに記載する金属ナノワイヤー含有導電性材料によって形成された導電性塗料。
〔７〕上記[１]〜上記[３]の何れかに記載する金属ナノワイヤー含有導電性材料によって形成された導電性塗膜。
〔８〕上記[１]〜上記[３]の何れかに記載する金属ナノワイヤー含有導電性材料によって形成された導電性フィルム。
According to the present invention, the following conductive materials are provided.
[1] Wire-shaped metal fibers (referred to as metal nanowires) having a major axis of 400 nm or more and a minor axis of 50 nm or less, and rod-shaped metal fibers (referred to as metal nanorods) having a major axis of less than 400 nm and an aspect ratio of 2 to 10 ) And a binder (resin), and the metal nanowires and metal nanorods are formed by a method of reducing metal ions in an aqueous solution containing a surfactant. The metal nanowire-containing conductive material, wherein the amount of nanofibers is 5 to 1900 parts by weight with respect to 100 parts by weight of the binder.
[2] The metal nanowire-containing conductive material according to [1] above, wherein a dispersant and a dispersion medium are blended in a binder (resin) together with metal nanowires and metal nanorods.
[3] The metal nanowire-containing conductive material according to the above [2] using a dispersant containing a nitrogen atom and / or a sulfur atom.
[4] A conductive paste formed of the metal nanowire-containing conductive material according to any one of [1] to [3].
[5] A wiring material formed of the metal nanowire-containing conductive material according to any one of [1] to [3].
[6] A conductive paint formed of the metal nanowire-containing conductive material according to any one of [1] to [3].
[7] A conductive coating film formed from the metal nanowire-containing conductive material according to any one of [1] to [3].
[8] A conductive film formed of the metal nanowire-containing conductive material according to any one of [1] to [3].
〔具体的な説明〕
本発明の導電性材料は、長軸４００nm以上および短軸５０nm以下であるワイヤー状金属繊維（金属ナノワイヤーと云う）と、長軸４００nm未満であってアスペクト比が２〜１０のロッド状金属繊維（金属ナノロッドと云う）とをバインダー（樹脂）に配合してなり、金属ナノワイヤーおよび金属ナノロッドは界面活性剤を含む水溶液中で金属イオンを還元する方法で形成されたものであり、金属ナノワイヤーおよび金属ナノロッド（金属ナノ繊維）の量がバインダー１００重量部に対して５〜１９００重量部であることを特徴とする金属ナノワイヤー含有導電性材料である。なお、以下の説明において金属ナノワイヤーと金属ナノロッドを含めて金属ナノ繊維と云う場合がある。
[Specific description]
The conductive material of the present invention includes a wire-like metal fiber (referred to as metal nanowire) having a major axis of 400 nm or more and a minor axis of 50 nm or less, and a rod-like metal fiber having a major axis of less than 400 nm and an aspect ratio of 2 to 10. (Referred to as metal nanorods) in a binder (resin), and the metal nanowires and metal nanorods are formed by a method of reducing metal ions in an aqueous solution containing a surfactant. The metal nanowire-containing conductive material is characterized in that the amount of metal nanorods (metal nanofibers) is 5 to 1900 parts by weight with respect to 100 parts by weight of the binder . In the following description, metal nanowires and metal nanorods may be referred to as metal nanofibers.
上記金属ナノワイヤーはナノサイズの粒径を有する微細粒子であるが、短軸に対して長軸が格段に長いので相互に絡み合った状態で含有されるものが多い。また、同様にナノサイズの粒径を有する金属ナノロッドは長軸の長さが金属ナノワイヤーより短いが、短軸に対して長軸が十分に長いので、相互に絡み合った状態で含有されるものが多い。具体的には、例えば、金属ナノワイヤーを分散剤と共に溶媒を含む塗料組成物に含有させた場合、塗料組成物の段階では良好な分散性を示し、かつ溶媒を蒸発させて塗膜の状態にすると、これらの金属ナノワイヤーが相互に絡み合い、あるいは接触した状態で塗膜中に存在するので、等重量の球状微粒子を用いた場合に比べて、球状微粒子よりも優れた導電性を有することができ、かつ導電性のバラツキが少ない。また、金属ナノワイヤーと共に金属ナノロッドを分散させたものは、金属ナノワイヤーが相互に絡み合った隙間に金属ナノロッドが入り込んだ状態で存在するので、導電性に優れている。このような作用効果の点から、上記金属ナノワイヤーは、上記長軸および上記短軸の範囲において、長軸４５０〜１５００nm、短軸１〜４５nmのものが好ましい。また、上記金属ナノロッドは、上記長軸および上記短軸の範囲において、長軸３０〜３００nmであってアスペクト比２〜１０のものが好ましい。 The metal nanowire is a fine particle having a nano-sized particle diameter, but since the major axis is remarkably long with respect to the minor axis, it is often contained in an intertwined state. Similarly, metal nanorods with nano-sized particle diameters are longer in length than metal nanowires, but are long enough for the short axis to be intertwined with each other. There are many. Specifically, for example, when metal nanowires are contained in a coating composition containing a solvent together with a dispersant, good dispersibility is exhibited at the coating composition stage, and the solvent is evaporated to form a coating film. Then, since these metal nanowires are intertwined with each other or are in contact with each other in the coating film, the metal nanowires may have a conductivity superior to that of spherical fine particles as compared with the case of using equal weight spherical fine particles. And there is little variation in conductivity. Moreover, what disperse | distributed the metal nanorod with the metal nanowire is excellent in electroconductivity, since it exists in the state which the metal nanorod entered in the clearance gap where the metal nanowire was mutually entangled. From the viewpoint of such effects, the metal nanowires preferably have a major axis of 450 to 1500 nm and a minor axis of 1 to 45 nm in the range of the major axis and the minor axis. The metal nanorods preferably have a major axis of 30 to 300 nm and an aspect ratio of 2 to 10 in the range of the major axis and the minor axis.
上記金属ナノワイヤーおよび金属ナノロッドは、例えば分散剤と共にペースト材料やインク材料などに配合される。この分散剤は窒素原子および／または硫黄原子を含有するものが好ましい。窒素原子や硫黄原子は金属ナノ繊維に対して高い吸着性を示すので、これらの原子を含む分散剤は金属ナノ繊維を均一に分散させることができ、金属ナノ繊維の分散性が良い組成物を得ることができる。この金属ナノ繊維含有組成物は金属ナノ繊維の分散性が良いので、金属ナノ繊維の含有量を抑制しても優れた導電性を有し、かつ導電性のバラツキが少ない。従って、導電性ペースト、配線材料、電極材料、導電性塗料、導電性塗膜、導電性フィルムなどに好適である。 The said metal nanowire and metal nanorod are mix | blended with paste material, ink material, etc. with a dispersing agent, for example. This dispersant preferably contains a nitrogen atom and / or a sulfur atom. Since nitrogen atoms and sulfur atoms exhibit high adsorptivity to metal nanofibers, a dispersant containing these atoms can uniformly disperse metal nanofibers, and a composition with good dispersibility of metal nanofibers can be obtained. Obtainable. Since the metal nanofiber-containing composition has good dispersibility of the metal nanofibers, it has excellent conductivity even when the content of the metal nanofibers is suppressed, and there is little variation in conductivity. Therefore, it is suitable for conductive paste, wiring material, electrode material, conductive paint, conductive coating film, conductive film and the like.
本発明の金属ナノ繊維を含有する導電性材料を用いた導電性ペーストや導電性インクは通常の導電性ペースト、導電性インクなどと同様の材料によって形成すれば良い。例えばバインダーとしては、通常の塗料用や成型用に利用されている各種樹脂が特に制限無く使用できる。具体的には、アクリル樹脂、ポリエステル樹脂、アルキド樹脂、ウレタン樹脂、シリコーン樹脂、フッ素樹脂、エポキシ樹脂、ポリカーボネート樹脂、ポリ塩化ビニル樹脂、ポリピニルアルコール等の各種有機樹脂や、ラジカル重合性のオリゴマーやモノマー（場合により硬化剤やラジカル重合剤開始剤と併用する）が代表的なものとして挙げられる。また溶媒としては、バインダーが溶解もしくは安定に分散するような溶媒を適宜選択すればよく、具体的には、水；メタノール、エタノール、プロパノール、ヘキサノール、エチレングリコール等のアルコール；キシレン、トルエン等の芳香族炭化水素；シクロヘキサン等の脂環式炭化水素：アセトン、メチルエチルケトン等のケトン；酢酸ブチル等のエステル、セルソルブアセテート等のエーテル等あるいはこれらの混合物が代表的なものとして挙げられるが、これらに限定されるものではない。 The conductive paste or conductive ink using the conductive material containing the metal nanofibers of the present invention may be formed of the same material as that of a normal conductive paste or conductive ink. For example, as the binder, various resins used for ordinary paints and moldings can be used without particular limitation. Specifically, various organic resins such as acrylic resin, polyester resin, alkyd resin, urethane resin, silicone resin, fluorine resin, epoxy resin, polycarbonate resin, polyvinyl chloride resin, and polypinyl alcohol, and radical polymerizable oligomers And monomers (sometimes used in combination with a curing agent or a radical polymerization initiator). Further, as the solvent, a solvent in which the binder is dissolved or stably dispersed may be appropriately selected. Specifically, water; alcohol such as methanol, ethanol, propanol, hexanol, and ethylene glycol; aroma such as xylene and toluene. Typical examples include aliphatic hydrocarbons; alicyclic hydrocarbons such as cyclohexane; ketones such as acetone and methyl ethyl ketone; esters such as butyl acetate; ethers such as cellosolve acetate; and mixtures thereof. Is not to be done.
上記金属ナノ繊維の配合量は目的の導電性が得られる量であれば良い。例えば、バインダー１００重量部に対して０.０１〜１９００重量部、好ましくは５〜１９００重量部であれば良い。金属ナノ繊維の量がこれより少ないと、例えば塗膜にしたときの表面抵抗値が高くなる。金属ナノワイヤーと金属ナノロッドの重量割合は金属ナノワイヤー７０以上：金属ナノロッド３０以下が適当である。
The compounding quantity of the said metal nanofiber should just be the quantity from which the target electroconductivity is acquired. For example, it may be 0.01 to 1900 parts by weight, preferably 5 to 1900 parts by weight with respect to 100 parts by weight of the binder. When the amount of the metal nanofiber is less than this, for example, the surface resistance value when the coating film is formed becomes high. The weight ratio between the metal nanowires and the metal nanorods is suitably from metal nanowires 70 to metal nanorods 30 or less.
本発明の導電性材料に用いる金属ナノワイヤーおよび金属ナノロッドは、界面活性剤を含む水溶液中で金属イオンを還元する方法によって得ることができる。具体的な還元方法としては、化学還元、電気化学的還元、光還元、または化学還元と光照射を組み合わせた方法などを利用することができる。 The metal nanowire and metal nanorod used for the conductive material of the present invention can be obtained by a method of reducing metal ions in an aqueous solution containing a surfactant. As a specific reduction method, chemical reduction, electrochemical reduction, photoreduction, a method in which chemical reduction and light irradiation are combined, or the like can be used.
金属ナノワイヤーおよび金属ナノロッドが、これらの金属ナノ繊維および水に対して親和性を有する界面活性剤を含む水溶液中で製造されたものであるとき、これらの金属ナノ繊維が分散する水分散液を、上記界面活性剤を溶解する脱離液および非水系分散剤の存在下で、非水溶媒と混合することによって、金属ナノ繊維を非水溶媒に安定に抽出することができる。また、上記分散剤として窒素原子や硫黄原子を含有するものを用いれば、この抽出方法によって得た金属ナノ繊維の非水系分散液を導電性材料の原料として好適に用いることができる。 When metal nanowires and metal nanorods are produced in an aqueous solution containing a surfactant having an affinity for these metal nanofibers and water, an aqueous dispersion in which these metal nanofibers are dispersed is used. The metal nanofibers can be stably extracted into a non-aqueous solvent by mixing with a non-aqueous solvent in the presence of a desorbing solution that dissolves the surfactant and a non-aqueous dispersant. Further, if a dispersant containing a nitrogen atom or a sulfur atom is used as the dispersant, a non-aqueous dispersion of metal nanofibers obtained by this extraction method can be suitably used as a raw material for the conductive material.
具体的には、ヘキサデシルトリメチルアンモニウムブロミド（CTAB）等を含む水溶液中で製造された金属ナノ繊維は、その表面にＣＴＡＢ等が吸着することによって安定に水中に分散している。これを導電性材料などに利用するには、水分散液からベンゼンやエーテルなどの有機溶媒（非水溶媒ないし非水系の分散媒）に抽出すれば適用範囲が広がるので好ましい。この抽出法として、界面活性剤を溶解する脱離液および非水系分散剤の存在下で、金属ナノ繊維の水分散液を非水溶媒に混合する方法を利用することができる。 Specifically, metal nanofibers produced in an aqueous solution containing hexadecyltrimethylammonium bromide (CTAB) or the like are stably dispersed in water by adsorbing CTAB or the like on the surface thereof. In order to use this as a conductive material or the like, it is preferable to extract from an aqueous dispersion into an organic solvent such as benzene or ether (a non-aqueous solvent or a non-aqueous dispersion medium) because the applicable range is widened. As this extraction method, a method of mixing an aqueous dispersion of metal nanofibers with a nonaqueous solvent in the presence of a desorbing solution that dissolves the surfactant and a nonaqueous dispersant can be used.
界面活性剤を溶解する脱離液としては、例えばメタノール、エタノールなどのアルコール類、アセトン、エチルメチルケトンなどのケトン類を用いることができる。 As the desorbing solution for dissolving the surfactant, for example, alcohols such as methanol and ethanol, and ketones such as acetone and ethyl methyl ketone can be used.
非水系分散剤としては、金属ナノ繊維に対して吸着性の高い元素である窒素原子、硫黄原子の何れかを吸着部位として有し、かつ非水溶媒に溶解する化合物が好ましい。例えば、(イ)窒素原子を主鎖中に有し、かつ非水溶媒に対して親和性のある側鎖を有する化合物、(ロ)チオール基を有し、かつ非水溶媒に対して親和性の側鎖を有する化合物、(ハ)アミノ基を有し、かつ非水溶媒に対して親和性のある側鎖を有する化合物などが挙げられる。 As the non-aqueous dispersant, a compound that has either a nitrogen atom or a sulfur atom, which is an element having high adsorptivity to metal nanofibers, as an adsorption site and is soluble in a non-aqueous solvent is preferable. For example, (a) a compound having a nitrogen atom in the main chain and a side chain having affinity for a nonaqueous solvent, (b) having a thiol group and affinity for a nonaqueous solvent And (c) a compound having an amino group and having a side chain having an affinity for a non-aqueous solvent.
上記(イ)の化合物は市販品を使用することができる。上記(ロ)の化合物としては、ブタンチオール、ヘキサンチオール、オクタンチオール、デカンチオール、ドデカンチオールなどが挙げられる。また、上記(ハ)の化合物としては、グリシン、アラニン、リシン、グルタミン酸、アスパラギン酸、フェニルアラニン、バリン、ロイシンなどが挙げられる。 A commercially available product can be used as the compound (a). Examples of the compound (b) include butanethiol, hexanethiol, octanethiol, decanethiol, and dodecanethiol. Examples of the compound (c) include glycine, alanine, lysine, glutamic acid, aspartic acid, phenylalanine, valine, and leucine.
上記脱離液および上記分散剤の存在下で、金属ナノ繊維水分散液を有機溶媒に混合すると、水分散液中の金属ナノ繊維の表面に吸着している界面活性剤が脱離液によって除去され、この界面活性剤に代わって上記分散剤が置換するので、金属ナノ繊維が水相から有機相に移行し、金属ナノ繊維を有機溶媒に抽出することができる。この金属ナノ繊維が分散した有機分散液は、窒素原子や硫黄原子を含む分散剤が金属ナノ繊維の表面に強く吸着しているので、金属ナノ繊維の分散性が良く、導電性材料の原料として好適である。 When the metal nanofiber aqueous dispersion is mixed with an organic solvent in the presence of the desorbing liquid and the dispersing agent, the surfactant adsorbed on the surface of the metal nanofibers in the aqueous dispersion is removed by the desorbing liquid. In addition, since the dispersant is substituted for the surfactant, the metal nanofibers are transferred from the aqueous phase to the organic phase, and the metal nanofibers can be extracted into the organic solvent. In the organic dispersion liquid in which the metal nanofibers are dispersed, the dispersing agent containing nitrogen atoms and sulfur atoms is strongly adsorbed on the surface of the metal nanofibers. Is preferred.
本発明に係る金属ナノワイヤーを含有する導電性材料は、金属ナノワイヤーが相互に絡み合い、あるいは接触した状態で存在し、球状微粒子に比べて接触面積が大きいので、優れた導電性を有することができ、かつ導電性のバラツキが少なく、球状金属微粒子を多量に配合したときに見られる経時的な不安定性がない。さらに、球状金属微粒子を用いた場合に比べて分散剤の量を低減することができ、分散剤に起因する導電性のバラツキを生じることがない。従って、本発明の金属ナノワイヤー含有導電性材料によれば、安定性、導電性に優れた導電性ペースト、配線材料、電極材料、導電性塗料、導電性塗膜、導電性フィルムなどを得ることができる。 The conductive material containing the metal nanowire according to the present invention exists in a state where the metal nanowires are intertwined with each other or in contact with each other, and has a large contact area compared to the spherical fine particles, and thus has excellent conductivity. And there is little variation in electrical conductivity, and there is no instability over time seen when a large amount of spherical metal fine particles are blended. Furthermore, the amount of the dispersant can be reduced as compared with the case where the spherical metal fine particles are used, and there is no variation in conductivity due to the dispersant. Therefore, according to the conductive material containing metal nanowires of the present invention, a conductive paste, wiring material, electrode material, conductive paint, conductive coating film, conductive film, etc. excellent in stability and conductivity can be obtained. Can do.
以下に本発明の実施例を示す。なお、各例において、窒素含有分散剤として市販品(商品名ソルスパース24000SC）を用いた。また、塗膜を形成した基板の表面抵抗値を測定した。測定器は三菱化学製機器(ロレスタ・ＧＰ)を用い、４端針法によって測定した。さらに、上記金ナノ繊維塗料の分散安定性を評価した（１ケ月放置後の粒子沈降の有無）。この結果を表１に示した。 Examples of the present invention are shown below. In each example, a commercially available product (trade name Solsperse 24000SC) was used as the nitrogen-containing dispersant. Further, the surface resistance value of the substrate on which the coating film was formed was measured. The measuring instrument was Mitsubishi Chemical equipment (Loresta GP) and measured by the four-end needle method. Furthermore, the dispersion stability of the gold nanofiber paint was evaluated (presence or absence of particle sedimentation after standing for 1 month). The results are shown in Table 1.
銀ナノワイヤー（長軸：約1μm、短軸：約10nm）６ｇ、窒素含有分散剤０.６ｇ、トルエン１０ｇ、アクリル樹脂０.４ｇからなる銀ナノワイヤー含有塗料を作製した。この塗料をガラス基板に塗布（膜厚1μm）し、乾燥（200℃、１時間）して塗布基板を得た。 A silver nanowire-containing coating composed of 6 g of silver nanowires (long axis: about 1 μm, short axis: about 10 nm), 0.6 g of a nitrogen-containing dispersant, 10 g of toluene, and 0.4 g of acrylic resin was prepared. This paint was applied to a glass substrate (film thickness: 1 μm) and dried (200 ° C., 1 hour) to obtain a coated substrate.
銀ナノワイヤー（長軸：約1μm、短軸：約10nm）５ｇ、銀ナノロツド（長軸：約50nm、短軸：約10nm）１ｇ、窒素含有分散剤０.６ｇ、トルエン１０ｇ、アクリル樹脂０.４ｇからなる銀ナノワイヤー含有塗料を作製した。この塗料をガラス基板に塗布（膜厚：１μm）し、乾燥（200℃、１時間）して塗布基板を得た。 Silver nanowire (long axis: about 1 μm, short axis: about 10 nm) 5 g, silver nanorod (long axis: about 50 nm, short axis: about 10 nm) 1 g, nitrogen-containing dispersant 0.6 g, toluene 10 g, acrylic resin 0.5 g A silver nanowire-containing paint consisting of 4 g was prepared. This paint was applied to a glass substrate (film thickness: 1 μm) and dried (200 ° C., 1 hour) to obtain a coated substrate.
〔比較例１〕
球状銀ナノ粒子（直径：約10nm）６ｇ、窒素含有分散剤０.６ｇ、トルエン１０ｇ、アクリル樹脂０.４ｇからなる球状銀ナノ粒子含有塗料を作製した。この塗料をガラス基板に塗布（膜厚：１μm）し、乾燥（200℃、１時間）して塗布基板を得た。
[Comparative Example 1]
A spherical silver nanoparticle-containing coating comprising 6 g of spherical silver nanoparticles (diameter: about 10 nm), 0.6 g of a nitrogen-containing dispersant, 10 g of toluene, and 0.4 g of acrylic resin was prepared. This paint was applied to a glass substrate (film thickness: 1 μm) and dried (200 ° C., 1 hour) to obtain a coated substrate.
表１に示すように、金属ナノワイヤーを有する導電性塗料の表面抵抗は、球状銀ナノ粒子を含む導電性塗料より低く、導電性に優れる。
As shown in Table 1, the surface resistance of the conductive coating material having metal nanowires is lower than that of the conductive coating material including spherical silver nanoparticles and is excellent in conductivity.
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