論文 / 著書情報
Article / Book Information
題目(和文)
Title(English)

Metallization and Functionalization of Flexible Silk Textile bySupercritical CO2 Promoted Electrochemical Techniques

著者(和文)

Chiu Wan-Ting

Author(English)

Wan-Ting Chiu

出典(和文)

学位:博士(工学),学位授与機関:東京工業大学,
報告番号:甲第10980号,
授与年月日:2018年9月20日,
学位の種別:課程博士,
審査員:曽根 正人,寺田 芳弘,木村 好里,細田 秀樹,三宮 工

Citation(English)

Degree:Doctor (Engineering),
Conferring organization: Tokyo Institute of Technology,
Report number:甲第10980号,
Conferred date:2018/9/20,
Degree Type:Course doctor,Examiner:,,,,

学位種別(和文)

博士論文

Category(English)

Doctoral Thesis種別(和文)論文要旨

Type(English)

Summary

Powered by T2R2 (Science Tokyo Research Repository)

（博士課程）Doctoral Program論 文 要 旨ＴＨＥＳＩＳ ＳＵＭＭＡＲＹ

専攻：
Department of

学生氏名：
Student’s Name

材料物理科学専攻

Chiu Wan-Ting

申請学位（専攻分野）：

博士

Academic Degree Requested

Doctor of

指導教員（主）：Academic Supervisor(main)

指導教員（副）：Academic Supervisor (sub)

（工学）
曽根正人

寺田

芳弘

要旨（和文 2000 字程度）
Thesis Summary （approx.2000 Japanese Characters ）Metallization and functionalization of textile materials are important topics toward
the applications of wearable devices such as bio-sensor and e-clothing. The integration of thedistinct materials such as polymer, metal, and oxides becomes the greatest challenge.
Electroless plating is a promising technique to combine metal materials and non-electricallyconductive polymer substrate together. This technique can especially be applied to thesubstrate with sophisticated structures such as textile. Electroless plating is divided into threemajor steps, pretreatment is the first step to clean and roughen the substrate, catalyzation is
the second step to embed the catalysts into the substrate making the substrate active, and thefinal step is metallization step to metallize the substrate. In the conventional catalyzation step,
the catalysts were only inlaid on the substrate surface due to the polar property of aqueous
solution. Supercritical carbon dioxide (sc–CO2) was introduced into the catalyzation step tosolve the aforementioned problems. Since sc–CO2 owns both the properties of gas and liquid
phases, affinity to non–polar material, non-corrosive to most of the polymers, and low surface
tension, it thus can bring the non–polar metal–organic complex catalysts (i.e. Palladium(II)acetylacetonate) to go into the polymer substrate and remains the substrate undamaged. In thisway, the adhesion between polymer substrate and deposited materials can be improved due toembedment of the catalysts into the substrate. On the other hand, sc–CO2 can also be
introduced into the metallization step to enhance the metallization properties. There areusually hydrogen evolutions during the metallization and the hydrogen bubbles might beembedded into the metallization layer resulting in the defects in the metallization layer. With
the help of sc–CO2 micelle bouncing in the solution, it can carry the H2 bubbles away andreduce the defects in the metallization layer. Therefore, sc-CO2 promoted electroless plating(i.e. sc–CO2 catalyzation and sc–CO2 metallization) was carried out for the integration ofmetal and textile materials.
Silk textile, a common cloth material, was chosen in this study on account of its
flexibility and stitchability. Ni–P was chosen due to its highly electrical conductivity, highcorrosion resistance, and high wear resistance. However, Ni shows allergic issue, Pt and Au
were thus chosen to solve the biocompatibility problems. In the meanwhile, Pt and Au also
own the highly electrical conductivity, high corrosion resistance, and high wear resistance. In
this study, metallization layers of Ni–P, Pt, and Au were integrated with silk textile by thesc–CO2 promoted electroless plating to achieve the composites toward the applications offlexible wearable devices.
In the meanwhile, the wearable devices are required to be equipped with different
functions such as the photovoltaic and photocatalytic devices in response to the requirementsof the next–generation technology. There are many materials that can play the role as thephotocatalyst in the composite material, such as TiO2, CuO, and ZnO. ZnO and TiO2 werechosen for the photocatalytic materials due to their proper band gap energies and low cost.
ZnO and TiO2 were fabricated on the metallized silk textile by the cathodic deposition andco–deposition methods to fulfill the requirements of photocatalytic properties.
The surface morphology, cross–section, and compositions of the silk/metal/oxide
composites were examined by an OM, SEM, and EDX. The crystal structures and phases
were identified by an XRD. Electrical resistances were evaluated by a four–point probe.
Electrical resistance was measured again after the adhesive test conducted by the tapepaste/peel–off tests for evaluating the adhesive firmness of the composites. Corrosion
resistances were measured by the polarization method in 3.5 wt.% NaCl and simulated bodyfluid (SBF), respectively. 3.5 wt.% NaCl was for simulating human sweat and SBF was forsimulating human body fluid. Biocompatibility was evaluated by the immersion test in theSBF solution. The evaluation of photocatalytic activities were conducted in a three–electrodecell consisting of a Pt counter electrode, Ag/AgCl reference electrode, and a piece of thesilk/metal/oxides as the working electrode. The evaluation processes were carried out at room
temperature and 1 atm. 0.5 M Na2SO4 solution was used as the electrolyte.
Metallized silk textile with proper electrical resistance ranges were fabricated for theapplications of wearable devices. The composites show firmly adhesive properties afteradhesive tests. Processed silk showed the high corrosion resistances in both 3.5 wt.% NaCland SBF solutions. Metallized silk textile equipped with ZnO or TiO2 showed the highphotocatalytic activity.
備考：論文要旨は、和文 2000 字と英文 300 語を 1 部ずつ提出するか、もしくは英文 800 語を 1 部提出してください。
Note : Thesis Summary should be submitted in either a copy of2000 Japanese Characters and 300 Words (Engｌish) or 1copy of 800

Words (English).
注意：論文要旨は、東工大リサーチリポジトリ（T2R2）にてインターネット公表されますので、公表可能な範囲の内容で作成してください。
Attention: Thesis Summary will be published on Tokyo Tech Research Repository

Website (T2R2).