Polyethenetetrathiolate or polytetrathiooxalate? Improved synthesis, a comparative analysis of a prominent thermoelectric polymer and implications to the charge transport mechanism

Abstract

Polymerisation of the “true monomer” results in a high quality product with improved and good reproducible characteristics.

A Printable Paste Based on a Stable n-Type Poly[Ni-tto] Semiconducting Polymer

“…Heat treatment of the polymer powder leads to an improvement in electrical conductivity ( [17]. Since the value of the Seebeck coefficient of the poly[Ni-tto], both in the sample not subjected to heat treatment and after heat treatment, coincides with the value of the Seebeck coefficient of the post-annealing poly[K x (Ni-ett)] powder, this serves as additional evidence of the hypothesis that we proposed in the previous article [9]-that tetrathiooxalate is the true monomer for a polymer of this type and does not need any additional chemical converting. cannot be dissolved either in most organic solvents or in water without destroying its chemical structure.…”

“…It is noteworthy that, unlike individual poly[Ni-tto] [9], the composite film does not show noticeable degradation in its TE properties during two months of storage under ambient conditions. It should also be noted that poly [Ni-tto] with different counterions was synthesized earlier [24,25] and very recently by Wolfe et al [26], who obtained poly[Ni-tto] and its composite with PVDF.…”

“…It is noteworthy that, unlike individual poly[Ni-tto] [9], the composite film does not show noticeable degradation in its TE properties during two months of storage under ambient conditions.…”

“…Polymer development. In this study, a poly[Ni-tto] polymer with good reproducible properties was synthesized according to the procedure described in detail in our previous articles [9,10]. Despite the formal difference between poly[Ni-tto] and the polynickelethenetetrathiolate (poly[K x (Ni-ett)]), which has been intensively studied over the past seven years [11][12][13][14][15][16], they both belong to the same class of coordination polymers and exhibit similar properties.…”

“…The authors obtained poly[Ni-tto] with various counterions: Li, Na and K. Nominally, a polymer with K as a counterion should be identical to the polymer we are considering in this paper. However, these compounds have significant differences in terms of the ratio of elements (compare the data from [9] and [26]) and, as a result, different TE properties. The annealed polyK[Ni-tto]/PVDF composite described by Wolfe has an electrical conductivity of about 21 S/cm and a Seebeck coefficient of 60 µV/K.…”