J
Jeffrey R. Simpson
Researcher at Towson University
Publications - 51
Citations - 4372
Jeffrey R. Simpson is an academic researcher from Towson University. The author has contributed to research in topics: Raman spectroscopy & Carbon nanotube. The author has an hindex of 26, co-authored 49 publications receiving 4026 citations. Previous affiliations of Jeffrey R. Simpson include University of Maryland, College Park & National Renewable Energy Laboratory.
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Journal ArticleDOI
High temperature ferromagnetism with a giant magnetic moment in transparent co-doped SnO(2-delta).
S. B. Ogale,R. J. Choudhary,James P. Buban,Samuel E. Lofland,S. R. Shinde,Sangeeta Kale,V. N. Kulkarni,Joshua Higgins,C. Lanci,Jeffrey R. Simpson,Nigel D. Browning,S. Das Sarma,H. D. Drew,R. L. Greene,T. Venkatesan +14 more
TL;DR: The occurrence of room temperature ferromagnetism is demonstrated in pulsed laser deposited thin films of Sn(1-x)Co(x)O(2-delta) (x<0.3) and a giant magnetic moment of 7.5+/-0.5 micro(B)/Co, not yet reported in any diluted magnetic semiconductor system.
Journal ArticleDOI
Thermal Conductivity of Monolayer Molybdenum Disulfide Obtained from Temperature-Dependent Raman Spectroscopy
Rusen Yan,Jeffrey R. Simpson,Simone Bertolazzi,Jacopo Brivio,Michael Watson,Xufei Wu,Andras Kis,Tengfei Luo,Angela R. Hight Walker,Huili Grace Xing +9 more
TL;DR: In this paper, the temperature-dependent Raman spectra of exfoliated, monolayer molybdenum disulfide (MoS2) in the range of 100-320 K were analyzed.
Thermal Conductivity of Monolayer Molybdenum Disulfide Obtained from Temperature-Dependent Raman
Spectroscopy Yan,Jeffrey R. Simpson,Simone Bertolazzi,Jacopo Brivio,Michael Watson,Xufei Wu,Huili Grace Xing +6 more
TL;DR: The temperature-dependent Raman spectra of exfoliated, monolayer MoS2 in the range of 100-320 K are reported and analyzed and the thermal conductivity is significantly lower than that of graphene.
Journal ArticleDOI
Ferromagnetism in laser deposited anatase Ti 1-x Co x O 2-δ films
S. R. Shinde,Satishchandra Ogale,S. Das Sarma,Jeffrey R. Simpson,H. D. Drew,Samuel E. Lofland,C. Lanci,James P. Buban,Nigel D. Browning,V. N. Kulkarni,Joshua Higgins,Ram P. Sharma,R. L. Greene,T. Venkatesan +13 more
TL;DR: In this paper, the authors examined the Co substitutionality, ferromagnetism, transport, magnetotransport, and optical properties of Co-doped anatase TiO 2 and found the presence of 20-50 nm Co clusters and a small concentration of Co incorporated into the remaining matrix.
Journal ArticleDOI
Isolation of specific small-diameter single-wall carbon nanotube species via aqueous two-phase extraction.
Jeffrey A. Fagan,Constantine Y. Khripin,Carlos A. Silvera Batista,Jeffrey R. Simpson,Erik H. Haroz,Angela R. Hight Walker,Ming Zheng +6 more
TL;DR: Aqueous two-phase extraction is demonstrated in this article to enable isolation of single semiconducting and metallic single-wall carbon nanotube species from a synthetic mixture, with remarkable tunability via modification of the surfactant environment set for the separation.