研究者詳細 - 秦　誠一

We investigated the effect of different solvents on the Cu micropatterns formed via femtosecond laser reduction patterning. Solvents such as ethylene glycol, 2-propanol, and glycerol were mixedwith CuO nanoparticles and polyvinylpyrrolidone. The degree of reduction and the resistivity of the fabricated micropatterns depended on the solvent. Glycerol was the most effective reducing agent. This solution was used to fabricate Cu/Cu2O composite micro-temperature sensors. Cu-rich electrodes and Cu2O-rich sensors were selectively formed by controlling the laser scanning speed at 5 mm/s and 0.5 mm/s, respectively, when the pulse energy was 0.53 nJ. The temperature sensor exhibited a negative temperature coefficient of the resistance, which was consistent with the value for Cu2O.

DOI： 10.20965/ijat.2016.p0934

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Direct Writing of Cu-based Micro-temperature Sensors onto Glass and Poly(dimethylsiloxane) Substrates Using Femtosecond Laser Reductive Patterning of CuO Nanoparticles

Mizue Mizoshiri, Seiichi Hata

Research & Reviews: Journal of Material Sciences 4 巻 ( 4 ) 頁： 47-54 2016年10月

Direct fabrication of Cu/Cu2O composite micro-temperature sensor using femtosecond laser reduction patterning

Mizoshiri, M; Ito, Y; Arakane, S; Sakurai, J; Hata, S

JAPANESE JOURNAL OF APPLIED PHYSICS 55 巻 ( 6 ) 頁： 06GP05 2016年6月

記述言語：英語出版者・発行元：IOP publishing

Micro-temperature sensors, which composed of a Cu<inf>2</inf>O-rich sensing part and two Cu-rich electrodes, were directly fabricated by femtosecond laser reduction patterning of CuO nanoparticles. Patterning of the microstructures was performed by laser scanning with pitches of 5, 10, and 15 µm. Cu<inf>2</inf>O-rich micropatterns were formed at the laser scan speed of 1 mm/s, the pitch of 5 µm, and the pulse energy of 0.54 nJ. Cu-rich micropatterns that had high generation selectivity of Cu against Cu<inf>2</inf>O were fabricated at the laser scan speed of 15 mm/s, the pitch of 5 µm, and the pulse energy of 0.45 nJ. Electrical resistivities of the Cu<inf>2</inf>O- and Cu-rich micropatterns were approximately 10 Ω m and 9 µΩ m, respectively. The temperature coefficient of the resistance of the micro-temperature sensor fabricated under these laser irradiation conditions was −5.5 × 10−3/°C. This resistance property with a negative value was consistent with that of semiconductor Cu<inf>2</inf>O.

DOI： 10.7567/JJAP.55.06GP05

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Fabrication of CuO-based antireflection structures using self-arranged submicron SiO2 spheres for thermoelectric solar generation

Kondo, T; Mizoshiri, M; Mikami, M; Itou, Y; Sakurai, J; Hata, S

JAPANESE JOURNAL OF APPLIED PHYSICS 55 巻 ( 6 ) 頁： 06GP07 2016年6月

記述言語：英語出版者・発行元：IOP publishing

We fabricated antireflection structures (ARSs) on the hot side of a thermoelectric generator (TEG) to absorb near-infrared (NIR) solar light with low reflective energy loss. First, the ARSs, composed of a CuO thin-film coated hemisphere array were designed using rigorous coupled wave analysis. Reflective loss was reduced to 6.7% at a grating period of 200 nm, as determined by simulation. Then, the ARSs were fabricated on a glass substrate using self-arranged submicron SiO<inf>2</inf>spheres, following the coating of a CuO thin film. Finally, the effect of the ARSs on NIR solar light generation was investigated by evaluating the generation properties of the TEG with the ARSs on the hot side. In comparison with the TEG with the CuO flat thin film on the hot side, the ARSs increased the temperature difference between the hot and cold sides by approximately 1.4 times. The CuO-based ARSs absorbed NIR solar light effectively.

DOI： 10.7567/JJAP.55.06GP07

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Fabrication of CuO-based anti-reflection structures using self-arranged submicron SiO2 spheres for thermoelectric solar generation 査読有り

Tasuku Kondou, Mizue Mizoshiri, Masashi Mikami, Junpei Sakurai, Seiichi Hata

Japanese Journal of Applied Physics 55 巻 ( 6S1 ) 2016年5月

Direct fabrication of Cu/Cu2O composite micro-temperature sensor using femtosecond laser reduction patterning 査読有り

Mizue Mizoshiri, Yasuaki Ito, Shun Arakane Junpei Sakurai, Seiichi Hata

Japanese Journal of Applied Physics 55 巻頁： 06GP05 2016年5月

記述言語：英語掲載種別：研究論文（学術雑誌）

Micro-temperature sensors, which composed of a Cu2O-rich sensing part and two Cu-rich electrodes, were directly fabricated by femtosecond
laser reduction patterning of CuO nanoparticles. Patterning of the microstructures was performed by laser scanning with pitches of 5, 10, and
15 µm. Cu2O-rich micropatterns were formed at the laser scan speed of 1 mm/s, the pitch of 5 µm, and the pulse energy of 0.54 nJ. Cu-rich
micropatterns that had high generation selectivity of Cu against Cu2O were fabricated at the laser scan speed of 15 mm/s, the pitch of 5 µm, and
the pulse energy of 0.45 nJ. Electrical resistivities of the Cu2O- and Cu-rich micropatterns were approximately 10 Ω m and 9 µΩ m, respectively. The
temperature coefficient of the resistance of the micro-temperature sensor fabricated under these laser irradiation conditions was %5.5 ' 10%3/°C.
This resistance property with a negative value was consistent with that of semiconductor Cu2O. © 2016 The Japan Society of Applied Physics

DOI： 1347-4065/55/6S1/06GP05

金属酸化物ナノ粒子を用いたフェムト秒レーザー還元直接描画法

溝尻瑞枝，秦誠一

OPTRONICS 35 巻 ( 413 ) 頁： 145-151 2016年5月

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