Abstract
Polynickeltetrathiooxalate (poly[Ni-tto]) is an n-type semiconducting polymer having outstanding thermoelectric characteristics and exhibiting high stability under ambient conditions. However, its insolubility limits its use in organic electronics. This work is devoted to the production of a printable paste based on a poly[Ni-tto]/PVDF composite by thoroughly grinding the powder in a ball mill. The resulting paste has high homogeneity and is characterized by rheological properties that are well suited to the printing process. High-precision dispenser printing allows one to apply both narrow lines and films of poly[Ni-tto]-composite with a high degree of smoothness. The resulting films have slightly better thermoelectric properties compared to the original polymer powder. A flexible, fully organic double-leg thermoelectric generator with six thermocouples was printed by dispense printing using the poly[Ni-tto]-composite paste as n-type material and a commercial PEDOT-PSS paste as p-type material. A temperature gradient of 100 K produces a power output of about 20 nW.
Highlights
IntroductionThe development of the “Internet of things” requires the availability of autonomous (semi-autonomous) power systems that are able to continuously supply different nodes (sensors, transmitters) with electricity
The development of the “Internet of things” requires the availability of autonomous power systems that are able to continuously supply different nodes with electricity
A poly[Ni-tto] polymer with good reproducible properties was synthesized according to the procedure described in detail in our previous articles [9,10]
Summary
The development of the “Internet of things” requires the availability of autonomous (semi-autonomous) power systems that are able to continuously supply different nodes (sensors, transmitters) with electricity. Since the ambient conditions often provide a particular heat source, which dissipates into the surrounding space, thermoelectric generators (TEGs), which convert a temperature difference into an electrical potential difference, are of particular interest. The scope of such devices is limited to thermogenerators for sensor nodes. When integrated into clothes, body heat can be harvested for the powering of wearable electronics [1] These materials have great potential for creating flexible temperature sensors [2] that are used in distributed diagnostics, robotics, electronic skins, functional clothing and many other. One of the basic requirements for such generators is their flexibility, which is necessary for the exact adjustment of the generator and the surface of the heat source
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