Time鈥揟emperature Indicator for Perishable Products Based on Kinetically Programmable Ag Overgrowth on Au Nanorods

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• 作者：Chao Zhang ; An-Xiang Yin ; Ruibin Jiang ; Jie Rong ; Lu Dong ; Tian Zhao ; Ling-Dong Sun ; Jianfang Wang ; Xing Chen ; Chun-Hua Yan
• 刊名：ACS Nano
• 出版年：2013
• 出版时间：May 28, 2013
• 年：2013
• 卷：7
• 期：5
• 页码：4561-4568
• 全文大小：512K
• 年卷期：v.7,no.5(May 28, 2013)
• ISSN：1936-086X

文摘

Food safety is a constant concern for humans. Besides adulteration and contamination, another major threat comes from the spontaneous spoilage of perishable products, which is basically inevitable and highly dependent on the temperature history during the custody chain. For advanced quality control and assessment, time鈥搕emperature indicators (TTIs) can be deployed to document the temperature history. However, the use of TTIs is currently limited by either relatively high cost or poor programmability. Here we describe a general, kinetically programmable, and cost-efficient TTI protocol constructed from plasmonic nanocrystals. We present proof-of-principle demonstrations that our TTI can be specifically tailored and thus used to track perishables, dynamically mimic the deteriorative processes therein, and indicate product quality through sharp-contrast multicolor changes. The flexible programmability of our TTI, combined with its substantially low cost and low toxicity, promises a general applicability to each single packaged item of a plethora of perishable products.

Keywords:

chronochromism; kinetic synchronicity; noble metal nanocrystals; perishables; localized surface plasmon resonance; time鈭抰emperature indicators