Photoluminescence Lab Analysis

PHYSICAL CHEMISTRY LABORATORY REPORT (CHE 414L) Department of Chemical Engineering School of Engineering and Architecture Saint Louis University Group No. 12 Members: DEMOT, Judy Ann SOMERA, Randolf P. TIPAYNO, Samantha TORZAR, Precious Imee I. Signatures: ____________________ ____________________ ____________________ ____________________

When exposed to sunlight, the the top layer of plasmonic nanoparticle discs produces hot electrons. After this step is complete, it is vital that the hot electrons are alienated from the electron holes, in order to preserve their energy. The middle layer of aluminum plays its part, as it causes for the electron holes to gravitate toward it. The bottom layer of nickel oxide traps the hot electrons, while allowing for the electron holes to pass through. If the device is immersed in water, the molecules can then be broken down into simpler

A glow stick is a short-term light source in the appearance of an opaque plastic tube containing isolated substances that can mix together and make light due to chemiluminescence. As it’s essentially a chemical reaction, the light cannot be turned off and can only be used once.

The percentage error was calculated to be 2.53%, which indicated that the calculated experimental value of the wavelength of the laser was very similar to the theoretical value.

Luminol is a chemical made up of eight carbon molecules,sevean hydrogen molecules,three nitrogen molecules,and two oxygen molecules. Chemiluminescence the emission of light in a chemical reaction which makes this substance glow a liquid blue when mixed with an oxidizing agent . In the reaction chemiluminescence does not exhibit significant amounts of heat giving off “cold light” via chemical reaction. Chemiluminescence is commonly found in deep oceans where many organisms have glowing organs the same reaction is found in glow sticks and fireflies. Oxidizing agents are a substance that brings out oxidation by reducing the electrons. Oxidation is a loss of electron in a reaction by a molecule,atoms or ion .

Photocatalysis is one of the clean and renewable technologies, utilizes naturally enormous abundant, clean and safe solar power. The cheap solar energy harnessing is one of the most exciting features to gain significant attention toward photocatalysis direction. Titanium oxide-based photocatalyst has shown considerable interest since the discovery because of the excellent properties such as chemical and photostability, eco-friendly nature and high catalytic reactivity.2,3 TiO2 photocatalysts have been widely engaged in various photocatalytic applications such as water and air cleaning, self-cleaning and anti-fogging TiO2 coated glasses, tiles, and shelters. TiO2 only generates electron-hole pairs under UV light, which are responsible for the photocatalytic reaction. There are numerous investigations have been done to alter the TiO2 structures to absorb visible lights. The strategy includes adding noble metals4, cations5, non-metals6, and metal oxides7 through various methods such as sol-gel8, physical ion-implantation methods,

2011; Li et al. 2012), metal oxides (Yuan et al. 2011; Dou et al. 2011), and bimetals (Shirsath et al. 2011; Ai et al. 2011). A composite of montmorillonite-ZnO prepared by Fatimah and Huda activity test was evaluated in methanol dehydration reaction (Fatimah & Huda 2012). Zn immobilized montmorillonite was evaluated as photocatalyst in a photocatalytic antibacteria of Eschericia coli and Staphylococcus aureussystem and showed the significant activity of material as photocatalyst (Fatimah

The photoelectron combines with a silver ion to form a neutral metallic silver atom. (Earle

By sеvеral diffеrеnt mеthods, including mеtal-organic vapour phasе еpitaxy (MOVPЕ), molеcular bеam еpitaxy (MBЕ) and pulsеd lasеr dеposition (PLD), thе ZnO еpitaxial layеrs and quantum wеlls havе bееn grown. Thе growth in c-axis oriеntеd dеspitе growth on a rangе of singlе crystal substratеs, including ZnO, sapphirе and Si oriеntеd along various crystal

169 nm, while the absorption coefficient at 355 nm (ag355) was used as a quantitative parameter of CDOM

The use of energetic materials has been increasing as the years go on. Azo-Tetrazolate belongs to high nitrogen content high-density energy materials (HNC, HEDMs). The norm for (HNC, HDEMs) is that they have good thermal stability, impact and shock insensitivity, good performance and the possibility for the formation of less smoke or soot. This seems nearly impossible, as having good thermal stability and impact insensitivity usually results in low explosive performance. The need for a good mix of all three qualities has resulted in growing interest in high-energy density materials, high nitrogen content (HEDMs, HNC). Azo-Tetrazolate and its derivatives are the most recent developments in this field. They come in the form of salts with high nitrogen content and high (positive) heats of formation. These salts have exhibited both good insensitivity to friction, shock, and electrostatic discharge while having a good performance value. The nonmetallic salts of 5,5′-azotetrazolate include Guanidinium Azo-Tetrazolate (GAT), Aminoguanidinium Azo-Tetrazolate (AGAT), Diaminoguanidinium Azo-Tetrazolate (DAGAT), Triaminoguanidinium Azo-Tetrazolate (TAGAT), and Ammonium Azo-Tetrazolate

For their part, SO4- ions react with the Zn2 + cations and become zinc sulfate molecules.

2. Miller, F.; Wilkins, C. Infrared Spectra and Characteristic Frequencies of Inorganic Ions. Ph.D. Dissertation, Mellon Institute, Pittsburgh, PA, 1952.

The photoluminescence (PL) spectroscopy was used to investigate the electronic and optical properties of nanoparticles as well as to elucidate the energy levels within the band gap region corresponding to the defect sites. Fig. 9 shows room temperature PL spectra of the as-prepared pristine and Na-doped CuO samples. The samples were excited using the excitation wavelength of 390 nm. The emission spectra of pristine and CuO:Na+ nanoparticles revealed intense sharp peak at 470 nm, 503 nm and 605 nm. The

In the present work, PVA-Ag nanocomposite films with thickness 0.18 mm, constant silver content (0.4 wt. %) and different time of reactions (0.1, 3, 5, 7, 9 h) were prepared by chemical reduction methods. Surface topology, optical and electrical properties of PVA-Ag nanocomposite were studied using absorption spectroscopy, electrometer, atomic force microscope (AFM) and photoluminescence (PL) spectroscopy were used to characterize the prepared nanocomposites. Optical absorption coefficient studies showed a peak at 427 nm for all samples, in addition to the peak at 200 nm for undoped PVA film. There is observable change in the absorbed intensity at 427 nm with the time of reaction. The refractive index was found increase with increasing the time of reaction. It was found that the root mean square (RMS) roughness. Frank-poole emission is the prevailing transport mechanism for all samples. While PL intensity at 427 nm increase as the time of reaction is increased.