Fluorescence suppression in Raman micro-spectroscopy using 830 nm laser
Raman spectroscopy is a non-destructive and non-contact technique for analysis of a wide range of materialsing from graphene to biological cells. Due to the intrinsic properties of probed materials, the choice of laser excitation wavelength has a direct impact on the reliability and sensitivity of measured Raman signals. As highlight in the previou..
Reflectance hyperspectral mapping with uSight-2000 potential for document forensic analysis
Forensic investigation is a fascinating subject popularized by crime movies and drama series. For instance, the movie “Catch Me If You Can” is based on the life of a cheque fraud. Unfortunately, cheque fraud and document forgery in general are still ubiquitous and happens more regularly than we know today.
The production of large scale and defect-free single-layer graphene is in high demand for their emerging applications in solar panel, light emitting devices, and etc.. However, it remains technically challenging to produce defect-free graphene at large scale. Very often, domains of defects and/or multi-layered graphene are present, and significantl..
Measurement of Emission Spectrum of Fluorescence Microbeads using uSight-2000
The demand for miniaturization has mandated that the dimension of colour pixels and photonic devices to be scaled down corresponding. For example, the latest smartphone’s CCD sensor size has decreased to as small as 1 micron. Therefore, it becomes more challenging to accurately determine the photon interaction of such small-scale photonic device ..
A monolayer of molybdenium disulfide (MoS2) has a unique and strong photoluminescence (PL) in the visible wavelength because of its direct bandgap at 1.8 eV (~680 nm). This unique characteristic makes monolayer MoS2 a good candidate for optoelectronic application. This is unlike bulk MoS2 with a few layers of MoSRead MoreDownload PDF
Application of uRaman for Polarized Raman Spectroscopy
Polarized Raman provides insightful information, such as molecular orientation and symmetries of molecular vibrations, to the Raman spectroscopy. These are additional information which is otherwise undetected by non-polarized Raman spectroscopy. Polarization of the molecule is brought about by the symmetrical vibra..
Determining Alcohol Content in Whisky Using Raman Spectroscopy
Alcoholic beverages are often adulterated with methanol to increase its alcohol content. However, methanol is a highly toxic chemical which can cause blindness, brain damage, hypothermia, seizures, and even death in severe case. In countries with under-regulated alcohol industry, it is often reported that people di..
The detection of highly diluted and small volume samples remains a challenge. To surmount the challenge, superhydrophobic surface-enhanced Raman spectroscopy substrate (SPHB-SERS) is fabricated. The strategy emphasizes on the synergy between intense electromagnetic ﬁeld brought about by single crystalline Ag nanoc..
Diamond Identification with Raman Microspectroscopy
Diamond, women’s best friend, is the all-time favourite for gem collector. Diamond is a symbol of beauty, perfection, wealth, and people are willing to pay high price for its perfection. Recently, a flawless 100-carat diamond was auctioned off for USD$22 million dollars. However, current synthetic diamond industr..
Raman spectroscopy is a valuable non-destructive and non-contact technique for analysis of a wide range of samples ranging from graphene to biological cells. Due to the difference in nature of the probed samples, the choice of laser excitation wavelength has a direct impact on the reliability and sensitivity of the..
Discrimination the Quality of Single-layer Graphene transferred on Silicon Oxide substrate
We demonstrate in this application note that uRaman microspectroscopy system from Technospex Pte. Ltd. is a promising instrument to determine the quality of the transferred single layered graphene on a 300-nm silicon dioxide (SiO2) substrate.Introduction
Graphene is a unique two-dime..
Application of uRaman for Surface Enhanced Raman Scattering
Raman signals are inherently weak and investigation of low concentration chemicals are usually carried out with expensive research-grade Raman microspectroscopy system. Surface-Enhanced Raman Spectroscopy or Surface-Enhanced Raman Scattering (SERS) is an amplification technique that enhances Raman scattering by mol..
UV-Vis Reflectance and Raman Microspectroscopy of Single and Multiple Layers Graphene
Graphene possesses extraordinary electric and optical properties, which have attracted enormous interests in electronic and photonic devices fabrication . However, the production of defect-free single-layer graphene still remains a challenge. Very often, defects and more-than-monolayer of graphene are produced, ..