Guidelines for bottom-up approach of nanocarbon film formation from pentacene using heated tungsten on quartz substrate without metal catalyst

Abstract

The guidelines for a bottom-up approach of nanographene formation from pentacene using heated tungsten were investigated using a novel method called hot mesh deposition (HMD). In this method, a heated W mesh was set between a pentacene source and a quartz substrate. Pentacene molecules were decomposed by the heated W mesh. The generated pentacene-based decomposed precursors were then deposited on the quartz substrate. The pentacene dimer (peripentacene) was obtained from pentacene by HMD using two heated catalysts. As expected from the calculation with the density functional theory in the literature, it was confirmed that the pentacene dimer can be formed by a reaction between pentacene and 6,13-dihydropentacene. This technique can be applied to the formation of novel nanographene on various substrates without metal catalysts.

Nanographene synthesis on metal film using pentacene, H2 gas and heated W mesh at low temperature

“…For the first time, it was confirmed that pentacene dimers (peripentacene) were obtained from pentacene monomers on a quartz substrate in HMD. 19) Although, the yield of pentacene dimers was low, the pentacene oligomer (N = 5) was obtained by using W Ni mesh. 20) In addition, the lowtemperature synthesis of nanographene on a Cu substrate was achieved.…”

Soft X-ray absorption and emission spectra of nanographene prepared from pentacene with hot mesh deposition and soft X-ray irradiation

“…For the first time, it was confirmed that Pn dimers (peripentacene) were obtained on a quartz substrate from Pn monomers by HMD. 15) Although, the yield was low, polymerization to Pn oligomer (PO) was achieved with using W Ni mesh. 16) In addition, the low-temperature fabrication of nanographene at 250 °C was achieved on a Cu substrate using Pn or DHP.…”

Detection and Crystal Structure of Hydrogenated Bipentacene as an Intermediate in Thermally Induced Pentacene Oligomerization

“…Roberson et al showed that under an inert gas flow at 320 °C, in competition with its sublimation, P disproportionates to give a 2:1 co-crystal of 6,13-dihydrogenated pentacene ( HP , Figure a) and P , and peripentacene ( PP , Figure a), detected by mass spectrometry. PP can be considered as two pentacene molecules completely fused along one long axis and has been described as a graphene fragment. , The mechanism for this transformation in the solid state is a matter of some debate, , and since the initial report of PP , considerable effort has gone into developing a rational route to its synthesis. , Thermolysis of a variety of other acenes has been demonstrated to drive both intramolecular C–C bonding , and intermolecular addition reactions to form oligomeric and graphitic species . Recently, Rogers et al succeeded in preparing single molecules of PP on an Au surface via the dehydrogenation of 6,6′-bipentacene ( BP , itself chemically synthesized in bulk from functionalized pentacene derivatives), which ab initio calculation proposes as an intermediate in PP formation in the solid state.…”

“…PP can be considered as two pentacene molecules completely fused along one long axis and has been described as a graphene fragment. 6,7 The mechanism for this transformation in the solid state is a matter of some debate, 4,8 and since the initial report of PP, considerable effort has gone into developing a rational route to its synthesis. 6,9 Thermolysis of a variety of other acenes has been demonstrated to drive both intramolecular C−C bonding 10,11 and intermolecular addition reactions to form oligomeric 12 and graphitic species.…”