A series of donor-acceptor polymers, namely PTEB, PMEB, PEEB, and PPEB, are designed and synthesized for temperature sensing. The polymers are composed of hemi-isoindigo as the acceptor unit, 3,3″-bis(dodecyloxy)-2,2″-bithiophene as the donor unit, and thiophene as the spacer unit. Carbamate solubilizing side chains are used to increase the solubility of the polymers in a green solvent anisole. Furthermore, the carbamate side chains can be thermally removed to form solvent-resistant polymers PTNB, PMNB, PENB, and PPNB, respectively. The removal of carbamate side chains also helps to elevate the highest occupied molecular orbital energy level of the polymer, thereby promoting p-doping. PMNB, PENB, and PPNB films are doped with 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4TCNQ) and used for fabricating temperature sensors on flexible polyethylene terephthalate substrates. The sensors exhibit high temperature coefficient of resistance (TCR) of up to −1.92 (±0.125)% °C⁻¹ at 20–60 °C. This is the highest TCR achieved to date for resistor-type temperature sensors using a non-composite single conductive polymer. High sensitivity, green solvent processability, and mechanical flexibility make these temperature sensors promising for use in low-cost, ubiquitous applications.

中文翻译：

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用于稳定温度传感器的绿色溶剂处理半异靛蓝聚合物

一系列供体-受体聚合物，即PTEB、PMEB、PEEB和PPEB，被设计和合成用于温度传感。该聚合物由作为受体单元的半异靛蓝、作为供体单元的3,3”-双(十二烷氧基)-2,2”-联噻吩和作为间隔单元的噻吩组成。氨基甲酸酯增溶侧链用于增加聚合物在绿色溶剂苯甲醚中的溶解度。此外，氨基甲酸酯侧链可以热去除形成耐溶剂聚合物PTNB、PMNB、PENB和PPNB， 分别。氨基甲酸酯侧链的去除也有助于提高聚合物的最高占据分子轨道能级，从而促进p-掺杂。PMNB、PENB和PPNB薄膜掺杂有 2,3,5,6-四氟-7,7,8,8-四氰基醌二甲烷 ( F4TCNQ )，用于在柔性聚对苯二甲酸乙二醇酯基板上制造温度传感器。传感器具有高达 -1.92 (±0.125)% °C ^{-1的高电阻温度系数 (TCR)}在 20–60 °C。这是迄今为止使用非复合单导电聚合物的电阻式温度传感器达到的最高 TCR。高灵敏度、绿色溶剂可加工性和机械灵活性使这些温度传感器有望用于低成本、无处不在的应用中。