Difference between the absorption intensity

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Reference no: EM133775905

Lab 1

OBJECTIVE

In this experiment, the synthesis of Au nanoparticles and constructing 2-dimensional arrays of metal nanoparticles on derivatised glass surfaces will be investigated using UV-Visible spectroscopy.

In this experiment, you will synthesise gold nanoparticles and investigate the Au nanoparticle self-assembly on glass microscope slides coated with a bifunctional organosilane.

By exposing clean glass slides to a solution of 1% 3-aminopropyltrimethoxysilane (APTMS) in methanol, reaction between the hydroxyl groups of the substrate and the organosilane occurs to form a siloxane bond. When the silanised surfaces are rinsed and exposed to Au colloid, the Au nanoparticles form a self-assembled monolayer at the surface. The process is shown schematically in Figure 1.

The Au colloid particles are negatively charged and bind to the coated surfaces by electrostatic interactions with the organosilane molecules. The intense red-wine colour of the Au particles enables surface formation on the transparent substrates to be monitored by measuring optical spectra.

QUESTION A1. Write a proposed mechanism for the reaction of the APTMS with the silanol groups on the glass surface.

QUESTION A2. At which wavelength is the UV/Vis peak of the Au colloid solution? What can you say about the size of the Au nanoparticles from this information?

QUESTION A3. What is the difference between the absorption intensity of your two surfaces exposed to the Au colloid solution? Explain the results.

QUESTION A4. What information about your sample do you get from determining the peak full width at half maximum height (FWHM)?

Part B1

OBJECTIVE

To perform synthesis of magnetic nickel nanowires using a nanoporous membrane as a template and observe their behaviours in the presence and in the absence of a magnet.

QUESTION B1. Write the electrochemical half reaction for the reduction of nickel in this experiment.

QUESTION B2. Where does this reduction occur? What is this electrode called?

QUESTION B3. Describe how you could change the procedure to alter the a. length and b. diameter of the nanowires.

QUESTION B4. Where would the nickel deposit if you reversed the +/- leads on the battery?

Reference no: EM133775905

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