198 research outputs found
Edge chirality determination of graphene by Raman spectroscopy
Raman imaging on the edges of single layer micromechanical cleavage graphene
(MCG) was carried out. The intensity of disorder-induced Raman feature (D band
at ~1350 cm-1) was found to be correlated to the edge chirality: it is stronger
at the armchair edge and weaker at the zigzag edge. This shows that Raman
spectroscopy is a reliable and practical method to identify the chirality of
graphene edge and to help in determination of the crystal orientation. The
determination of graphene chirality is critically important for fundamental
study as well as for applications.Comment: 14 pages, 3 figures, 1 tabl
Spectroscopic studies of two dimensional carbon nanostructures and semiconductor quantum dots
Ph.DDOCTOR OF PHILOSOPH
Promoting Long-Term Survival of Insulin-Producing Cell Grafts That Differentiate from Adipose Tissue-Derived Stem Cells to Cure Type 1 Diabetes
BACKGROUND: Insulin-producing cell clusters (IPCCs) have recently been generated in vitro from adipose tissue-derived stem cells (ASCs) to circumvent islet shortage. However, it is unknown how long they can survive upon transplantation, whether they are eventually rejected by recipients, and how their long-term survival can be induced to permanently cure type 1 diabetes. IPCC graft survival is critical for their clinical application and this issue must be systematically addressed prior to their in-depth clinical trials. METHODOLOGY/PRINCIPAL FINDINGS: Here we found that IPCC grafts that differentiated from murine ASCs in vitro, unlike their freshly isolated islet counterparts, did not survive long-term in syngeneic mice, suggesting that ASC-derived IPCCs have intrinsic survival disadvantage over freshly isolated islets. Indeed, β cells retrieved from IPCC syngrafts underwent faster apoptosis than their islet counterparts. However, blocking both Fas and TNF receptor death pathways inhibited their apoptosis and restored their long-term survival in syngeneic recipients. Furthermore, blocking CD40-CD154 costimulation and Fas/TNF signaling induced long-term IPCC allograft survival in overwhelming majority of recipients. Importantly, Fas-deficient IPCC allografts exhibited certain immune privilege and enjoyed long-term survival in diabetic NOD mice in the presence of CD28/CD40 joint blockade while their islet counterparts failed to do so. CONCLUSIONS/SIGNIFICANCE: Long-term survival of ASC-derived IPCC syngeneic grafts requires blocking Fas and TNF death pathways, whereas blocking both death pathways and CD28/CD40 costimulation is needed for long-term IPCC allograft survival in diabetic NOD mice. Our studies have important clinical implications for treating type 1 diabetes via ASC-derived IPCC transplantation
Gold on graphene as a substrate for surface enhanced Raman scattering study
In this paper, we report our study on gold (Au) films with different
thicknesses deposited on single layer graphene (SLG) as surface enhanced Raman
scattering (SERS) substrates for the characterization of rhodamine (R6G)
molecules. We find that an Au film with a thickness of ~7 nm deposited on SLG
is an ideal substrate for SERS, giving the strongest Raman signals for the
molecules and the weakest photoluminescence (PL) background. While Au films
effectively enhance both the Raman and PL signals of molecules, SLG effectively
quenches the PL signals from the Au film and molecules. The former is due to
the electromagnetic mechanism involved while the latter is due to the strong
resonance energy transfer from Au to SLG. Hence, the combination of Au films
and SLG can be widely used in the characterization of low concentration
molecules with relatively weak Raman signals.Comment: 11 pages, 4 figure
Interference enhancement of Raman signal of graphene
Raman spectroscopic studies of graphene have attracted much interest. The
G-band Raman intensity of a single layer graphene on Si substrate with 300 nm
SiO2 capping layer is surprisingly strong and is comparable to that of bulk
graphite. To explain this Raman intensity anomaly, we show that in addition to
the interference due to multiple reflection of the incident laser, the multiple
reflection of the Raman signal inside the graphene layer must be also accounted
for. Further studies of the role of SiO2 layer in the enhancement Raman signal
of graphene are carried out and an enhancement factor of ~30 is achievable,
which is very significant for the Raman studies. Finally, we discuss the
potential application of this enhancement effect on other ultra-thin films and
nanoflakes and a general selection criterion of capping layer and substrate is
given.Comment: 13 pages, 3 figures to be published in Applied Physics Letter
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