I have excitation spectrum at 370 nm of wavelength when 520 nm of emission wavelength. But I did not get any of absorbance at 370 nm in UV-Vis spectrum for same sample. What is the reason for this? This results observed from carbon quantum dots.
What is the reason for the shift in fluorescence emission spectra with excitation wavelength, in the case of excitation independent fluorescence emission? Please see attached figure. It is...
03 April 2018 8,969 2 View
Dear all, I used carbon coated copper grid 200 mesh for my sample (gold nanoclusters dispersed in ethanol) to get images. Sometimes I got different types of ring-shaped damage after few...
10 November 2016 599 10 View
The pH is 12, Thank you in advance...
01 February 2016 8,341 1 View
I am getting always wrong size of particles (size calculated from HRTEM image, and UV-Vis spectra) for fluorescent gold clusters and carbon quantum dots. but DLS spectra gives reliable results for...
01 January 1970 7,908 1 View
I want to know the mechanism of electronic state & its changes during Aggregation Induced Emission (AIE) and Aggregation Induced Emission Enhancement (AIEE). Some reports says the reason for...
01 January 1970 5,130 4 View
A crude extract of fungal culture using EtOH was subjected to column and TLC and partially purified compound was obtained. UV vis spectrum of the compound/s has max absorbance at 218nm. The...
11 August 2024 9,800 2 View
Hello, Why do i see this baseline drift when i compare my blank (black) to the sample (blue)? Any suggestions as to why this happened? Thank you!
11 August 2024 3,769 4 View
I am using Rhodamine6G as gain medium and silver nanoparticles as scatterers on a microscope slide and laser input 532 nm comes from above.
09 August 2024 9,894 2 View
After immunohistochemistry of previously fixed in PFA and EtOH and then frozen 20 μm sections of zebrafish brain, DAPI staining is very weak (right) compared to the same sections stained without...
05 August 2024 9,637 2 View
Hello everyone, I'm encountering an issue with my electrochemical impedance spectroscopy (EIS) measurements and would appreciate some insights. Experimental Setup: Electrodes: Gold interdigitated...
05 August 2024 3,781 2 View
Are there any fluorescently labeled anti-Alpaca secondary antibodies raised in Donkey? So far I have only been able to find anti-Alpaca secondaries raised in Goat. Or is this not possible due to...
04 August 2024 4,255 1 View
Hello, everyone. I have tried to determine carrier motilities of some materials, by Density Functional Theory, using Quantum ESPRESSO. There are a few methods to do it, like a package called...
04 August 2024 8,891 1 View
Hello. I am working on ROS production of two systems: system A is cerium oxide and hydrogen peroxide, system B is cerium oxide nanoparticle, hydrogen peroxide and potassium bromide. I did some...
04 August 2024 5,973 3 View
How to calculate the molar proportions of the oxides from the XRF analyses?
02 August 2024 2,565 2 View
I'm researching light sources and their UV emissions. I'm curious if a 50W, 7500K conventional LED lamp emits any UV light. I found that a 200W tungsten lamp can emit up to 1.5 mW/cm² at 350 nm....
31 July 2024 3,842 7 View