What is the bandgap of CuO?
CuO is a thermally and chemically stable medium bandgap semiconductor with a bandgap energy in the range of 1.2–2.6 eV varying with the preparation conditions [[11], [12], [13]] and is usually shown as p-type conductivity due to the presence of copper vacancy defects [14].
Is CuO a semiconductor?
Cupric Oxide (CuO), is an inexpensive and non-toxic p-type semiconductor material with a monoclinic crystal structure having indirect band gap (Eg) 1.2 eV -1.9 eV.
How do you find the direct and indirect band gap?
A common and simple method for determining whether a band gap is direct or indirect uses absorption spectroscopy. By plotting certain powers of the absorption coefficient against photon energy, one can normally tell both what value the band gap is, and whether or not it is direct.
Is CuO FCC?
The fcc. CuO was fabricated by a solution chemical method using a specific hydrophilic surfactant, such as polyvinyl pyrrolidone, as the capping agent for controlling the shape, and size.
What color is CuO?
valences: cuprous oxide, Cu2O, and cupric oxide, CuO. Cuprous oxide, a red crystalline material, can be produced by electrolytic or furnace methods. It is reduced readily by hydrogen, carbon monoxide, charcoal, or iron to metallic copper. It imparts a red colour to glass and is used for antifouling paints.
What is the band gap of the bulk material?
Bulk silicon has an indirect bandgap of 1.1 eV, which limits its photon absorption capacity to the visible and near infrared (IR) region of the electromagnetic spectrum, and is a major factor contributing to its low efficiency as a photodetector.
How do you find the band gap of bulk material?
Then you can calculate the band gap energy by using equation: Eg (eV) = 1240/(wavelength in nm). For example, if the intensity arises from the baseline at 340 nm, then you have a material with band gap of 3.65 eV.
Which is more stable CuO and Cu2O?
Compare to Cu2O, CuO is more thermally stable materials because of the stability of CuO with high oxidation number [2].
Why is CuO a base?
Since copper (II) oxide is a metallic oxide so it is basic in nature. -When CuO is in aqueous solution, it does not dissociate completely in it which means that it is a weak base. Also when it is dissolved in water, it forms copper hydroxide (Cu(OH)2).
What is the band gap for bulk CdSe?
At room temperature the band gap of CdSe is 1.74 eV.
How do you calculate band gap?
The value of the band gap (Eg) can be obtained by using the Tauc relation, : αhν = A (hν – Eg )n where α is absorption coefficient given by α = 1/t ln [(1-R)2 / T] where t is the sample thickness, T and R are the transmission and reflection, while (hν) is the photon energy, where: hν(eV) = 1240 / [incident wavelength ( …
Which is easier to reduce Cu2O or CuO?
The reduction of CuO is easier than the reduction of Cu2O. The apparent activation energy for the reduction of CuO is about 14.5 kcal/mol, while the value is 27.4 kcal/mol for Cu2O. During the reduction of CuO, the system can reach metastable states (MS) and react with hydrogen instead of forming Cu2O.
What is the difference between Cu2O and CuO?
Differences Between Cuprous Oxide (Cu2O) and Copper (Cupric) Oxide (CuO) Nanoparticles. Copper, which is a d block element, is named as cuprous or cupric based on the electronic configuration. The main difference between cuprous and cupric is that cuprous is copper +1 cation whereas cupric is copper +2 cation.
Is CuO a weak base?