69 research outputs found
Increase of SERS Signal Upon Heating or Exposure to a High-Intensity Laser Field: Benzenethiol on an AgFON Substrate
The surface-enhanced Raman scattering (SERS) signal from an AgFON plasmonic
substrate, recoated with benzenethiol, was observed to increase by about 100%
upon heating for 3.5 min at 100C and 1.5 min at 125C. The signal intensity was
found to increase further by about 80% upon a 10 sec exposure to a
high-intensity (3.2 kW/cm^2) 785-nm cw laser, corresponding to 40 mW in a
40+/-5-um diameter spot. The observed increase in the SERS signal may be
understood by considering the presence of benzenethiol molecules in an
intermediate or 'precursor' state in addition to conventionally ordered
molecules forming a self-assembled monolayer. The increase in the SERS signal
arises from the conversion of the molecules in the precursor state to the
chemisorbed state due to thermal and photo-thermal effects.Comment: 9 pages, 4 figures; J. Phys. Chem. C, accepte
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Redirecting research efforts on the diversification-performance linkage: The search for synergy
We review the literature on the diversification-performance (D-P) relationship to a) propose that the time is ripe for a renewed attack on understanding the relationship between diversification and firm performance, and b) outline a new approach to attacking the question. Our paper makes four main contributions. First, through a review of the literature we establish the inherent complexities in the D-P relationship and the methodological challenges confronted by the literature in reaching its current conclusion of a non-linear relationship between diversification and performance. Second, we argue that to better guide managers the literature needs to develop along a complementary path – whereas past research has often focused on answering the big question of does diversification affect firm performance, this second path would focus more on identifying the precise micro-mechanisms through which diversification adds or subtracts value. Third, we outline a new approach to the investigation of this topic, based on (a) identifying the precise underlying mechanisms through which diversification affects performance; (b) identifying performance outcomes that are “proximate” to the mechanism that the researcher is studying, and (c) identifying an appropriate research design that can enable a causal claim. Finally, we outline a set of directions for future research
In Vivo, Transcutaneous Glucose Sensing Using Surface-Enhanced Spatially Offset Raman Spectroscopy: Multiple Rats, Improved Hypoglycemic Accuracy, Low Incident Power, and Continuous Monitoring for Greater than 17 Days
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