Depth resolution during C60+ profiling of multilayer molecular films.
Time-of-flight secondary ion mass spectrometry is utilized to characterize the response of Langmuir-Blodgett (LB) multilayers under the bombardment by buckminsterfullerene primary ions. The LB multilayers are formed by barium arachidate and barium dimyristoyl phosphatidate on a Si substrate. The unique sputtering properties of the C60 ion beam result in successful molecular depth profiling of both the single component and multilayers of alternating chemical composition. At cryogenic (liquid nitrogen) temperatures, the high mass signals of both molecules remain stable under sputtering, while at room temperature, they gradually decrease with primary ion dose. The low temperature also leads to a higher average sputter yield of molecules. Depth resolution varies from 20 to 50 nm and can be reduced further by lowering the primary ion energy or by using glancing angles of incidence of the primary ion beam.
Zheng
Leiliang
L
Department of Chemistry, The Pennsylvania State University, 104 Chemistry Building, University Park, Pennsylvania 16802, USA.
Wucher
Andreas
A
Winograd
Nicholas
N
D017609:Barium Compounds / Q000737:chemistry; D004537:Eicosanoic Acids / Q000737:chemistry; D037741:Fullerenes / Q000737:chemistry*; D007477:Ions / Q000737:chemistry; D010712:Phosphatidic Acids / Q000737:chemistry; D018629:Spectrometry, Mass, Secondary Ion / Q000379:methods*; D013696:Temperature
D017609:Barium Compounds; D004537:Eicosanoic Acids; D037741:Fullerenes; D007477:Ions; D010712:Phosphatidic Acids; C094477:arachidic acid
Rapid Commun Mass Spectrom. 1998;12(18):1246-52
9772767
Anal Chem. 2007 Jun 15;79(12):4493-8
17503768
Anal Chem. 2004 Nov 15;76(22):6651-8
15538789
J Phys Chem B. 2005 Jun 23;109(24):11973-9
16852476
J Am Soc Mass Spectrom. 2008 Jan;19(1):96-102
18293488
Anal Chem. 2004 Mar 1;76(5):1264-72
14987080
Appl Surf Sci. 2006 Jul;252(19):6716-6718
18079999
Anal Chem. 2005 Jun 1;77(11):3651-9
15924401
J Am Soc Mass Spectrom. 2007 Mar;18(3):406-12
17118671
Anal Chem. 2003 Sep 1;75(17):4402-7
14632043
J Phys Chem B. 2008 Mar 6;112(9):2596-605
18254619
Appl Surf Sci. 2008 Dec 15;255(4):816-818
19551160
Philos Trans A Math Phys Eng Sci. 2004 Jan 15;362(1814):55-75
15306276
J Phys Chem B. 2006 Apr 27;110(16):8329-36
16623517
Anal Chem. 2005 Feb 1;77(3):911-22
15679361
Phys Rev Lett. 2006 Jun 2;96(21):216104
16803256
Anal Chem. 2007 Jan 15;79(2):494-9
17222012
Anal Chem. 2008 Mar 15;80(6):2125-32
18278949
Anal Chem. 2008 Jul 15;80(14):5293-301
18549239
Anal Chem. 2005 Dec 15;77(24):7950-7
16351142
Anal Chem. 2006 Oct 15;78(20):7206-10
17037922
Anal Chem. 2004 Jun 1;76(11):3199-207
15167802
Anal Chem. 2007 Mar 15;79(6):2199-206
17302385
Rapid Commun Mass Spectrom. 1998;12(19):1303-12
9773521
Anal Chem. 2004 Dec 15;76(24):7234-42
15595864