A light emitter based on practicable and mass-producible polycrystalline graphene patterned directly on silicon substrates from a solid-state carbon source

Abstract

We developed a procedure for direct patterning graphene with arbitrary position, size, and shape on Si from a solid-state carbon source without dry etching. Our light emitting devices perform on a par with those based on high crystallinity graphene.

Microemitter-Based IR Spectroscopy and Imaging with Multilayer Graphene Thermal Emission

“…The graphene temperatures, obtained by the fitting of Planck’s law, are estimated to be 1238, 1340, 1455, and 1596 K at V p–p = 1.25, 1.30, 1.35, and 1.40 V, respectively. These temperatures are consistent with the previously reported temperatures in graphene emitters. − ,,, Furthermore, we also demonstrated the measurement of longer-wavelength emission spectra up to 10 μm in air by using the Al 2 O 3 -capped unsuspended graphene microemitter, which enables us to measure the lower-wavenumber IR analysis (Figure S2).…”

“…These temperatures are consistent with the previously reported temperatures in graphene emitters. [12][13][14][15][16][17][18][19][20][21][22]24,25,27 Furthermore, we also demonstrated the measurement of longer-wavelength emission spectra up to 10 μm in air by using the Al 2 O 3 -capped unsuspended graphene microemitter, which enables us to measure the lowerwavenumber IR analysis (Figure S2).…”

“…Because smaller graphene with the size of ∼10 nm is technically possible, this graphene-based IR analysis has the potential for higher-resolution IR microscopy, which will be comparable to probe-based IR microscopy, such as AFM-IR and s-SNOM, in the future. In addition, mass-produced graphene microemitters can be developed by using large-scale graphene grown by chemical vapor deposition (CVD) graphene or the directly patterned graphene on silicon substrates . Hence, this IR spectroscopy and microscopy based on graphene microemitters can open the door to microscale analytical chemistry and quantitative analysis for any ultrasmall matter, such as nanomaterials, biological samples, difficult to synthesize substances, and hazardous substances.…”

“…In this study, we propose novel IR absorption spectroscopy and imaging using a multilayer-graphene microemitter as an IR source. Graphene is a promising material for an IR light source owing to its unique thermal properties and enables a high-speed, small footprint, on-chip, and bright IR emitter based on blackbody radiation by Joule heating. − These features of a graphene microemitter can realize the new method of sensitive IR absorption and imaging as follows: (i) Bright IR emission can be obtained from the small-footprint graphene microemitter because the graphene is stable at high temperature under high-current-density emission because of its large π conjugated system. (ii) High-speed and direct modulation of a graphene IR microemitter enables the sensitive measurement of IR absorption by a synchronous signal detection technique with a lock-in amplifier in spite of the extremely small footprint of graphene microemitters in contrast to large and slow incandescent light bulbs.…”

Evolution of Graphene Patterning: From Dimension Regulation to Molecular Engineering

“…The method of using a solid‐state carbon source to grow GNRs with the aid of a Ni catalyst can also be completed by direct heating ( Figure ). [ 117 ] Following a similar procedure, Ni and amorphous carbon film were deposited on a Si substrate as a catalyst and a carbon source, respectively. After patterning the prepared films via lift‐off lithography, the sample was heated up to 1100 °C in vacuum and then cooled to room temperature, leading to the formation of GNRs.…”