Fabrication and Properties of Fullerodendron Thin Films

Abstract

Thin films of fullerodendron (C(60)(Gn-COOMe) (n = 0.5, 1.5, 2.5)), which was synthesized from fullerene and anthracenyl poly(amido amine) dendron with methyl ester terminals and different generations (G), were fabricated by the Langmuir-Blodgett (LB) and adsorption techniques. It was characterized by X-ray reflectometry that the LB films possessed well-ordered structure, although the adsorption method led to random orientation of molecules. As to C(60)(G0.5-COOMe) and C(60)(G1.5-COOMe), the LB films took a four-layer structure consisting of a double layer of molecules, and fullerene moieties exist in the interior of the LB films. On the other hand, C(60)(G2.5-COOMe) led to a two-layer structure in which the fullerene moieties were at the air side and the dendron moieties were at the substrate side. With increasing generation of dendron, the monolayer formation ability at the air/water interface as amphiphilic molecule strengthens and the amphiphilic property becomes superior to the fullerene-fullerene attractive interaction that prevents the monolayer formation. Furthermore, in the case of C(60)(G0.5-COOMe) and C(60)(G1.5-COOMe), the reduction peak in cyclic voltammetry of the LB film remained even after UV light irradiation. On the contrary, the peak of the C(60)(G2.5-COOMe) LB film disappeared, indicating that molecular arrangement in the films affects electrochemical properties.

Self- or Induced Organization of [60]Fullerene Hexakisadducts

“…from slightly above room temperature up to 165 C for 18 and 180 C for 21. This behavior is quite different from that of the precursory malonate 17 which displayed two monotropic unidentified phases at 41 C and 67 C and a chiral nematic phase between 67 C and 88 C (Table 2). An increase of the mesophase stability of about 100 C as well as a near room temperature mesomorphism was thus obtained through C 60 grafting.…”

“…In the latter field, working at the air-water interface, various mono- [32][33][34][35][36][37][38] and bis- [39] [60]fullerene derivatives have been studied in the past years and showed encouraging results in terms of film quality and stability, roughness, reversibility, and transferability onto solid substrates. For example, F. Diederich and coworkers [40] or Imae and coworkers [41] showed that fullerene monoadducts bearing dendritic branches display good spreading characteristics and reversible compression/expansion behavior has been described. Working on [60]fullerene bisadducts, Nierengarten and coworkers have shown that encapsulation of the carbon sphere in a cyclic addend surrounded by either long alkyl chains [42,43] or cholesterol subunits [44] is a method of choice for obtaining stable and reversible monomolecular thin films, easily transferred onto solid substrates in order to prepare high quality LB multilayers.…”

Fabrication of field‐effect transistor devices with fullerene related materials

“…Here, it should be noted that the formation of π-conduction channel path between the C 60 moieties is a key point for a realization of higher µ value. Especially, the FET device exhibiting a better performance may be realized with the fullerodendron films because fullerodendron molecules in the Langmuir-Blodgett (LB) films formed on SiO 2 surface are known to exhibit ordered structure [8]. This expectation is our motivation for the use of fullerodendron molecules as active layers in this study.…”

Spreading behaviour of a series of amphiphilic [3 : 3] [60]fullerene hexakisadducts: a systematic study

“…In the latter field, working at the air-water interface, various [60]fullerene derivatives ranging from mono- [19][20][21][22][23][24][25], to bis- [26], up to hexa-adducts [27][28][29][30] have been studied in the past few years and showed encouraging results in terms of film quality and stability, roughness, reversibility, and transfer onto solid substrates. For example, Cardullo et al [31] or more recently Hirano et al [32] showed that fullerene mono-adducts bearing dendritic branches display good spreading characterisitics and reversible compression/ expansion behaviour has been described. Working on [60]fullerene bis-adducts, Nierengarten et al have shown that encapsulation of the carbon sphere in a cyclic addend surrounded by either long alkyl chains [33,34] or cholesterol subunits [35] is a method of choice for obtaining stable and reversible monomolecular thin films, easily transferred onto solid substrates in order to prepare high-quality LB multilayers.…”