Related Experiment Video
Updated: Feb 13, 2026
09:43
Interfacial Molecular-level Structures of Polymers and Biomacromolecules Revealed via Sum Frequency Generation Vibrational Spectroscopy
Published on: August 13, 2019
9.9K
Characterisation, coverage, and orientation of functionalised graphene using sum-frequency generation spectroscopy.
Huda S AlSalem1, Chloe Holroyd2, Melissa Danial Iswan2
1School of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK and Photon Science Institute, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK and School of Chemistry, Princess Nourah bint Abdulrahman University, Riyadh, Saudi Arabia.
Physical Chemistry Chemical Physics : PCCP
|March 21, 2018
Summary
Researchers detected phenyl groups on functionalized graphene using sum-frequency generation spectroscopy. This non-linear technique offers sensitive and specific characterization of graphene chemical functionalization.
Area of Science:
- Materials Science
- Spectroscopy
- Surface Chemistry
Background:
- Graphene functionalization is crucial for tailoring its properties.
- Characterizing the covalent attachment of organic molecules to graphene is challenging.
- Non-linear spectroscopic techniques offer potential for sensitive surface analysis.
Purpose of the Study:
- To unambiguously detect phenyl groups covalently attached to functionalized graphene.
- To demonstrate the utility of sum-frequency generation (SFG) spectroscopy for this purpose.
- To explore the potential of SFG for assessing functional group coverage and orientation.
Main Methods:
- Chemical functionalization of graphene on a gold surface using benzene diazonium salt.
- Sum-frequency generation (SFG) spectroscopy for vibrational analysis.
- Comparison with a benzenethiol self-assembled monolayer on gold for spectral assignment.
Main Results:
- Unambiguous detection of phenyl groups covalently attached to graphene.
- Observation of a distinct aromatic C-H stretch resonance at 3064 cm-1.
- Demonstration of SFG spectroscopy's high sensitivity and specificity for functionalized graphene.
Conclusions:
- Sum-frequency generation spectroscopy is a powerful tool for characterizing functionalized graphene.
- SFG provides superior sensitivity and specificity compared to other techniques.
- SFG can quantify functional group coverage and determine their orientation on graphene surfaces.
Related Concept Videos
01:22Sums of Power
78
In definite integration, Riemann sums approximate the area under a curve by dividing it into subintervals and summing the areas of rectangles. When these approximations follow predictable numerical patterns, such as arithmetic or polynomial sequences, sum formulas offer a more efficient and accurate way to compute the result. In particular, the sum of consecutive integers, squares, and cubes plays an essential role in simplifying these calculations, especially when dealing with uniform...
78
01:21Wilcoxon Rank-Sum Test
778
The Wilcoxon rank-sum test, also known as the Mann-Whitney U test, is a nonparametric test used to determine if there is a significant difference between the distributions of two independent samples. This test is designed specifically for two independent populations and has the following key requirements:
778
01:22Sum and Difference OpAmps
1.4K
Operational amplifiers (op-amps) are versatile devices that extend beyond amplification. In this context, two specific op-amp configurations are explored: the summing and difference amplifiers.
A summing amplifier, or an adder, utilizes an op-amp to merge multiple input signals into a single output signal. When audio signals are introduced into its input channels, the input resistors initiate currents that traverse feedback resistors, resulting in an output voltage. Applying Kirchhoff's current...
A summing amplifier, or an adder, utilizes an op-amp to merge multiple input signals into a single output signal. When audio signals are introduced into its input channels, the input resistors initiate currents that traverse feedback resistors, resulting in an output voltage. Applying Kirchhoff's current...
1.4K
01:13Location and Orientation of the Heart
10.8K
The human heart, despite its modest size and weight, is an organ of remarkable strength and endurance. Roughly the size of a fist, the heart weighs between 250 and 350 grams and is nestled within the mediastinum, the medial cavity of the thorax. It extends obliquely for about 12 to 14 cm, resting on the superior surface of the diaphragm. The heart is positioned anterior to the vertebral column and posterior to the sternum, with two-thirds of its mass lying to the left of the midsternal line.
10.8K
01:21Frequency-dependent Selection
24.2K
When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.
24.2K
00:51What is a Frequency Distribution
27.8K
A frequency is the number of times a value of the data occurs. The sum of all the frequency values represents the total number of students included in the sample. It is commonly used to group data of quantitative types. Frequency distributions can be displayed in a table, histogram, line graph, dot plot, or pie chart, just to name a few. A histogram is a graphical representation of tabulated frequencies, shown as adjacent rectangles, erected over discrete intervals (bins), with an area equal to...
27.8K