A hinge mounting apparatus for mounting a hinge of a portable electronic device is provided. The PCBA includes a printed circuit board and a connector that is attached to one end of the PCB. Cooling allows part of the H2S contained in the gas to be condensed. In addition, with the optimization of a mechanical structure of a single noble metal single-crystal nanowire and a polarization direction of laser beam, sensitivity, selectivity and signal intensity become high.