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What color is cuprous oxide?

wallpapers News 2021-06-03
What is cuprous oxide?
Cuprous oxide is a semiconductor with a band gap ranging from 2.0 to 2.2 eV and has photovoltaic characteristics. As a copper p-type oxide with a chemical formula of Cu 2 O, it can exist in the form of thin films or nanoparticles. Because of its low cost, it provides new physical properties and is very useful for basic research.
How to synthesize cuprous oxide?
Thermal oxidation, chemical vapor deposition, anodic oxidation, reactive sputtering, electrodeposition, plasma evaporation, sol-gel dip coating technology even after extensive research, a major obstacle to the use of these methods is to produce a mixture of Cu, CuO and Cu2O Phase, resulting in very few applications of cuprous oxide as a semiconductor.

Is cuprous oxide toxic?
Acute toxicity: mouse oral LD50: 470mg/kg; mouse abdominal LD50: 380mg/kg; when the dust content of this product in the air reaches 0.22~14mg/m3, it will cause acute poisoning after 1~2 hours of work, which manifests as Headache, weakness, redness of the pharynx and conjunctiva, nausea, muscle pain, sometimes vomiting and diarrhea, fatigue, and elevated body temperature. One day later, the body temperature can return to normal, but still weakness, headache, dizziness, rapid pulse rate, and increased lymphocytes. For acute poisoning patients, use a certain concentration of K4[Fe(CN)6] solution for gastric lavage, take milk and other measures. The maximum allowable concentration in the air is 0.1mg/m³. Wear masks, dust-proof glasses, protective work clothes, and take a shower after work.
Chronic poisoning is manifested as: the local skin, hair and conjunctiva of workers exposed to copper compounds sometimes turn light yellow or black green, and there are dark red or magenta edges on the gums. It is irritating to the skin, and the dust irritates the eyes and causes corneal ulcers.

The properties and stability of cuprous oxide
If used and stored in accordance with specifications, it will not decompose. There are no known dangerous reactions. Avoid oxides, moisture/humidity, and air.
Do not encounter dilute sulfuric acid and dilute nitric acid to generate copper salt. Will quickly turn blue in the air. It can be dissolved in concentrated alkali, ferric chloride and other solutions.
Although cuprous oxide is stable in dry air, it will slowly oxidize in humid air to produce copper oxide, so it can be used as an oxygen scavenger; in addition, it can be easily reduced to metallic copper with a reducing agent. Cuprous oxide is insoluble in water, and it dissolves by forming a complex with aqueous ammonia solution and concentrated hydrohalic acid, and is very easy to dissolve in alkaline aqueous solution.
If you want to learn more about metal oxides, please click on the following link:
What are the color metal oxides?
What is the yellow oxide powder?

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