Quality and safety of the cold chain undergo strict international regulations that identify storage and shipping temperatures. In fact, the improper handling and transportation of temperature-sensitive products such as food and pharmaceuticals may have harmful effects on human health and a negative economic impact. A passive RFID tag modified with a copper-doped ionic liquid was used to detect the crossing of a temperature threshold (8 °C) during the shipping of medical products. The tag was insensitive to humidity variations and irreversibly changed its status once temperature exceeded the ionic liquid melting point, which can be tuned by changing the concentration of dopant.

冷链的质量和安全性经过严格的国际法规来确定存储和运输温度。实际上，对温度敏感的产品（如食品和药品）的不正确处理和运输可能对人体健康产生不利影响，并对经济产生负面影响。使用掺杂有铜的离子液体修饰的无源RFID标签用于检测医疗产品运输过程中温度阈值（8°C）的交叉。标签对湿度变化不敏感，一旦温度超过离子液体熔点即可不可逆地更改其状态，可以通过改变掺杂剂的浓度对其进行调节。