In this paper, we show that positive and negative charges can be injected into the surface of SiO(2)/Si(3)N(4)/SiO(2)/GaAs/AlGaAs heterostructure material by using a biased tip of a scanning probe microscope. Furthermore, the injected charges can be erased with the same tip once grounded, working in slow scan and contact mode. Surface potential measurements by quantitative analysis of Kelvin probe force microscopy after drawing and erasing charges at room temperature are presented and discussed.
A Synthesis of (±)-Lavandulol Using a Silyl-to-Hydroxy Conversion in the Presence of 1,1-Disubstituted and Trisubstituted Double Bonds.-The presence of TmsCl in the addition reaction of silylcuprates and silylzincates to α,β-unsaturated aldehydes, esters, ketones and amides unsubstituted at the β-position affords higher yields of silylated products such as (X), and in most cases the silylzincates are superior to silylcuprates. This method is applied to the synthesis of lavandulol (VII) using the cuprate derived from silane (IX). The substitution of the methylbutenyl group at the silicon by fluoride is possible under mild enough conditions that do not attack the allyl double bond. For the synthesis of the silyl chloride precursor of (IX) an improved method is given. -(FLEMING, I.; LEE, D.; J.
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