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We expect that the demonstrated application of etching to shaping of colloidal heteronanocrystals can become a common methodology in the synthesis of charge - separating nanocrystals , leading to advanced nanoparticles architectures for applications in areas of photocatalysis , photovoltaics , and light detection .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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