Nakajima Takumi, Hoshino Koki, Yamamoto Hisatoshi, Kaneko Keisuke, Okano Yutaro, Takashiri Masayuki
Department of Materials Science, Tokai University, 4-1-1 Kitakaname, Hiratsuka 259-1292, Kanagawa, Japan.
Sensors (Basel). 2024 May 6;24(9):2946. doi: 10.3390/s24092946.
As power sources for Internet-of-Things sensors, thermoelectric generators must exhibit compactness, flexibility, and low manufacturing costs. Stretchable and flexible painted thermoelectric generators were fabricated on Japanese paper using inks with dispersed p- and n-type single-walled carbon nanotubes (SWCNTs). The p- and n-type SWCNT inks were dispersed using the anionic surfactant of sodium dodecylbenzene sulfonate and the cationic surfactant of dimethyldioctadecylammonium chloride, respectively. The bundle diameters of the p- and n-type SWCNT layers painted on Japanese paper differed significantly; however, the crystallinities of both types of layers were almost the same. The thermoelectric properties of both types of layers exhibited mostly the same values at 30 °C; however, the properties, particularly the electrical conductivity, of the n-type layer increased linearly, and of the p-type layer decreased as the temperature increased. The p- and n-type SWCNT inks were used to paint striped patterns on Japanese paper. By folding at the boundaries of the patterns, painted generators can shrink and expand, even on curved surfaces. The painted generator (length: 145 mm, height: 13 mm) exhibited an output voltage of 10.4 mV and a maximum power of 0.21 μW with a temperature difference of 64 K at 120 °C on the hot side.
作为物联网传感器的电源，热电发电机必须具备紧凑性、柔韧性和较低的制造成本。利用含有分散的p型和n型单壁碳纳米管（SWCNT）的墨水，在日本纸上制备了可拉伸且柔韧的印刷热电发电机。p型和n型SWCNT墨水分别使用十二烷基苯磺酸钠阴离子表面活性剂和二甲基二辛基氯化铵阳离子表面活性剂进行分散。涂覆在日本纸上的p型和n型SWCNT层的束直径有显著差异；然而，两种类型层的结晶度几乎相同。两种类型层的热电性能在30°C时大多呈现相同的值；然而，随着温度升高，n型层的性能，特别是电导率呈线性增加，而p型层的性能则下降。p型和n型SWCNT墨水被用于在日本纸上绘制条纹图案。通过在图案边界处折叠，印刷发电机即使在曲面上也能收缩和扩展。该印刷发电机（长度：145毫米，高度：13毫米）在热侧温度为120°C、温差为64 K时，输出电压为10.4毫伏，最大功率为0.21微瓦。
