早在六十五年前,就知道了化学沉淀PbS镜面状薄膜的方法。它是制备近红外PbS探测器的基础。为了获得高光导性的薄膜,在沉淀槽中通常加进过氧化氢的“氧化剂”。已发表的关于H_2O_2作用的推测,违背了几十年来易接受的一些基本的化学知识。例如,1937年的教科书叙述了如下的定量反应:PbS+4H_2O_2→PbSO_4+4H_2O(1)在PbS光导体的制造中,达到开始反 As early as sixty-five years ago, we know the method of chemical precipitation PbS mirror-like film. It is the basis for the preparation of near-infrared PbS detectors. In order to obtain a highly photoconductive film, a hydrogen peroxide “oxidizing agent” is usually added to the precipitation tank. Published speculations on the role of H 2 O 2 violate some basic chemistry that has been accepted for decades. For example, the 1937 textbook describes the following quantitative reaction: PbS + 4H 2 O 2 → PbSO 4 + 4H 2 O (1) In the manufacture of PbS photoconductors,