Sample number

KOH concn. (weight%)

Sonic. time (hr)

Energy gap

(ev)

Crystallite size (nm)

1

3

2

1.87

32.2

2

3

1.56

47.8

3

4

1.75

30.1

4

4.5

2

1.83

31.5

5

3

1.48

55.44

6

4

1.37

63

7

6

2

1.62

44

8

3

1.92

33

9

4

2.08

27.2