Q：What is Nanometer? 什麼是次奈米？What is Photocatalyst?什麼是光觸媒？

A： Nanometer (nm) -- length of the unit is 10-9 meters. For most cases when particle size is in the range of 1-100 nm, this is claim as nanometer. The uses of nanotechnology will greatly change the lives of human beings in the future. Scientists termed them as the world's third industrial revolution. Measurement of less than 10-9 meters is known as sub-nanometer.

Generally speaking, photocatalyst is the substance which can modify the rate of chemical reaction using light irradiation.Chlorophyll of plants is a typical natural photocatalyst. The difference between chlorophyll photocatalyst to man-made nanotechnology photocatalyst (here mentioned as photocatalyst) is, usually chlorophyll captures sunlight to turn water and carbon dioxide into oxygen and glucose, but on the contrary photocatalyst creates strong oxidation agent and electronic holes to breakdown organic matter to carbon dioxide and water in the presence of photocatalyst, light and water.

A：奈米(nano meter)是10-9公尺長度單位。當一種物質之粒徑大小介於1-100奈米時，可冠上奈米。奈米科技的運用將大大改變人類今後的生活，科學家稱之為世界第三次工業革命。粒徑小於10-9公尺稱為次奈米。光觸媒 (photocatalyst) 是以光為催化劑的一種材料，它就像宇宙的黑洞一樣，能吸收光線產生能源，讓周圍分子產生劇烈運動，以分解周圍對環境及人體有害的有機物質。