Abstract: The present application describes a sensor apparatus based on chemically functionalized graphene as the sensing materials. The sensing materials is modified from graphene oxide with unique chemical process to form a group of graphene derivatives, e.g. butylamine, hexylamine, decylamine, dodecylamine, benzylamine etc., to detect volatile and non-volatile compounds, e.g. toluene, ethylacetate, ethanol, acetone, hexane etc. with high sensitivity. Pattern recognition algorithms and methods, e.g. PCA, are coupled with the sensors for detecting and quantifying specific chemical compounds. Methods of using the sensor apparatus in applications such as diagnosis of disease and food quality control are disclosed.

Abstract: An apparatus for fastening a product to its package for shipment and display. The apparatus includes a key having a base, an inner pad and outer ring portions. The base includes two bridges supporting two pairs of living hinges, each of the pairs being connected to an outer ring portion. The outer ring portions are enabled to pivot between a position generally aligned with the inner pad and a position generally perpendicular to the inner pad so as to act as a handle to rotate the key. The inner pad supports a post and a pair of protrusions. Between the inner pad and the outer ring portions are openings for receiving a strip of stiff paper. After the key is inserted through the package and into the product, the key is rotated to cause an abutment of the protrusions with the product to fasten the product and package together. The strip is then inserted to prevent inadvertent rotation of the key.