1887
banner image
No data available.
Please log in to see this content.
You have no subscription access to this content.
No metrics data to plot.
The attempt to load metrics for this article has failed.
The attempt to plot a graph for these metrics has failed.
Synthesis of higher diamondoids by pulsed laser ablation plasmas in supercritical CO2
Rent:
Rent this article for
USD
10.1063/1.3599887
/content/aip/journal/jap/109/12/10.1063/1.3599887
http://aip.metastore.ingenta.com/content/aip/journal/jap/109/12/10.1063/1.3599887

Figures

Image of FIG. 1.
FIG. 1.

(Color online) Carbon nanomaterials classification: (a) sp 2-hybridized carbon: fullerene, CNT, and graphene; (b) sp 3-hybridized carbon: diamondoids compared with 381-carbon tetrahedral diamond. For clarity, the H-terminations are not shown except for those in adamantane.

Image of FIG. 2.
FIG. 2.

(Color online) Experimental setup for the laser ablation of HOPG in scCO2 with and without cyclohexane as a cosolvent, including dissolved adamantane: (a) top view and (b) magnified side view.

Image of FIG. 3.
FIG. 3.

Experimental setup for pyrolysis treatment of the samples.

Image of FIG. 4.
FIG. 4.

(Color online) Micro-Raman spectra of synthesized products obtained by PLA (a) in scCO2 before pyrolysis and (b) after pyrolysis; (c) in scCO2 with cyclohexane before pyrolysis, and (d) after pyrolysis, (e) in scXe before pyrolysis.13 For illustrating the effect of increasing cage number, the Raman spectra of (f) commercial adamantane and (g) [12312] hexamantane (taken from Ref. 22) are also included as examples.

Image of FIG. 5.
FIG. 5.

(Color online) GC-MS mass spectra at t = 7.3 min: (a) the synthesized product obtained in neat scCO2, (b) scCO2 and cyclohexane, and (c) diamantane of the standard sample, with the inset showing the structure of diamantane.

Image of FIG. 6.
FIG. 6.

(Color online) Calibration curve fitted to the GC-MS SIM peak area corresponding to m/z 188 in cyclohexane solution with dissolved diamantane. The GC-MS scan rate was 1.79 scans/s.

Image of FIG. 7.
FIG. 7.

(Color online) Number of cages in diamondoids obtained by scCO2 with and without cyclohexane plotted as a function of the GC-MS relative retention time, taking the retention time of diamantane as a standard.

Image of FIG. 8.
FIG. 8.

GC-MS mass spectra of possible superadamantane (MW 456) obtained by PLA in scCO2. The inset shows the molecular structure.

Image of FIG. 9.
FIG. 9.

GC-MS mass spectra of possible diamondoids after pyrolysis: MW 448 (heptamantane, C34H40) obtained by PLA in scCO2 with cyclohexane. The inset shows [121212] heptamantane, which is one of the possible isomers possessing MW of 448.

Tables

Generic image for table
Table I.

Experimental conditions for the pulsed laser ablation in scCO2 with and without cyclohexane.

Generic image for table
Table II.

SIM peak area and estimated diamantane concentration of the product obtained by PLA in scCO2.

Generic image for table
Table III.

List of possibly synthesized diamondoids by PLA in scCO2, with their molecular formulae, MWs, GC-MS relative retention times, and dual graph codes.

Generic image for table
Table IV.

List of possibly synthesized diamondoids by PLA in scCO2 with cyclohexane as a cosolvent, with their molecular formulae, MWs, GC-MS relative retention times, and dual graph codes.

Generic image for table
Table V.

List of observed higher diamondoids for PLA in scCO2 after pyrolysis.

Generic image for table
Table VI.

List of observed higher diamondoids for PLA in scCO2 with cyclohexane after pyrolysis.

Loading

Article metrics loading...

/content/aip/journal/jap/109/12/10.1063/1.3599887
2011-06-24
2014-04-23
Loading

Full text loading...

This is a required field
Please enter a valid email address
752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Synthesis of higher diamondoids by pulsed laser ablation plasmas in supercritical CO2
http://aip.metastore.ingenta.com/content/aip/journal/jap/109/12/10.1063/1.3599887
10.1063/1.3599887
SEARCH_EXPAND_ITEM