Abstract: The gas sensor according to an exemplary embodiment of the present invention comprises: an FET device including one or more gate electrodes; a sensor array part including a plurality of sensors, in which a first electrode of each sensor is connected to at least one gate electrode of the plurality of gate electrodes in the FET device; and a controller detecting a gas using a current between a drain-source in response to voltage changes in the gate electrode of the FET device, wherein each sensor includes: a first electrode connected to a gate electrode of the FET device; a second electrode receiving an operating voltage through a switch controlled by the controller; and a detection film interposed between the first electrode and the second electrode.

Abstract: Provided is a metal frame for an electronic part and capable of minimizing defects such as an electric short circuit caused by whiskers. The metal frame may include a lead unit electrically connected to an electronic device, and the lead unit may include a first metal layer that contains copper (Cu) as a main component and further contains boron (B) or beryllium (Be).

Abstract: The present invention is provided to prevent the generation of whiskers via a lead (Pb)-free solder alloy. To achieve this objective, the present invention provides a Pb-free solder alloy including tin (Sn) as a first element and either boron (B) or beryllium (Be) as a second element.

Abstract: A steel having an improved tensile strength includes a first layer formed of an ultra-low carbon steel; and a second layer that is formed in contact with the first layer, includes a first surface opposite to the first layer, is formed of a solid solution obtained by solid-solving nitrogen in the ultra-low carbon steel, and has a structure substantially the same as a structure of the first layer.

Abstract: The object of the present invention is to prevent generation of whisker in a Pb-free plating layer. Provided is a Pb-free Sn—B plating solution containing tin sulfate, which is a source of Sn ions, and dimethyl amine borane or trimethyl amine borane, which is a source of B ions.

Abstract: Provided is a method for nitriding a metal in a salt bath by using a non-cyanide salt and a nitrided metal manufactured using the same. The method includes the steps of: immerging at least one salt selected from the group consisting of KNO3, KNO2, Ca(NO3)2, NaNO3 and NaNO2 into the salt bath; melting the salt by heating and maintaining the molten salt at a predetermined temperature; and submerging the metal in the salt bath. Nitriding in non-cyanide salts, such as potassium nitrate (KNO3), potassium nitrite (KNO2), sodium nitrate (NaNO3), sodium nitrite (NaNO2), calcium nitrate (Ca(NO3)2) and their mixtures, is capable of solving an environmental pollution problem and reducing a cost. Also, the method is capable of increasing nitrided depth of the metal two to six times compared to conventional nitriding methods. As a result, the method can be carried out in various application fields.