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This paper shows that NP size , morphology , and synthesis method can have a significant effect on the sintering temperature and sintering quality for Cu NPs .
 morphology, sintering, sintering, quality, Cu
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
Answer:
 morphology, sintering, sintering, quality, Cu