Figure 7.

(a) Preliminary study of the kinetics of the water-driven structural transformation shown in Fig. 6. Displayed are difference XRD patterns at various times following addition of water (the initial pattern has been subtracted). The appearance and growth of sphalerite-like (111), (220) and (311) diffraction peaks show the time evolution of the structural transformation. Data acquired at beamline 2.1, SSRL. (b) The X-ray diffraction pattern of ZnS nanoparticles, 19 h following water addition (data from Fig. 7a), is compared with the pattern acquired 24 h after water addition to a prior synthesis batch (data from Fig. 6). The extent of transformation is considerably different in the two cases. This is attributed to differences in the nanoparticle aggregation state in the two batches.