In industrial production, friction and wear are the main causes of material damage, increasing energy consumption and mechanical equipment scrapping, which has brought serious economic losses. The purpose of lubrication is to reduce friction, wear and energy consumption. The important means of lubrication technology is the use of lubricants, which can be divided into liquid lubricants, solid lubricants and solid-liquid compatible lubricants.

With the rapid development of modern industry, a large number of untreated industrial wastewater and other untreated wastewater are discharged directly into the nature, causing huge pollution damage to the environment and seriously affecting human health. However, the traditional environmental governance has many problems, such as high energy consumption, high cost, low efficiency and incomplete governance.

The increasing development of modern industry not only improves people's living standards, but also brings unavoidable damage to the ecological environment. Nitric oxide (NO) emitted from organic matter decomposition, fossil fuel combustion and chemical industry is a common atmospheric pollutant, which is one of the main substances to form acid rain and photochemical smog, and has great damage to the environment. Therefore, the research of nitrogen dioxide gas sensor components has important significance and development prospects.

With the development of modern industry, the situation of air pollution, water pollution and soil pollution is getting worse and worse. People feel the harm of environmental pollution to themselves. Protecting the environment is to save themselves. People urgently need a low cost, high efficiency and energy for non-toxic degradation and purification.